Monney, C., Schwier, E. F., Battaglia, C., Garnier, M. G., Mariotti, N., Didiot, C., ...
The charge density wave phase transition of 1T-TiSe2 is studied by angle-resolved photoemission over a wide temperature range. An important chemical potential shift which strongly evolves with...
Self-energy effects and electron-phonon coupling in Fe-As superconductors (2009)
Lemmens, P., Eremin, I., Zwicknagl, G., Berger, H., Sun, G. L., ...
We report on Raman scattering experiments of the undoped SrFe2As2 and superconducting Sr0.85K0.15Fe2As2 (Tc=28K) and Ba0.72K0.28Fe2As2 (Tc=32K) single crystals. The frequency and linewidth of the B1g...
Magnetite: Raman study of the high-pressure and low-temperature effects (2009)
Gasparov, L. V., Arenas, D., Guntherodt, G., Berger, H., Forro, L., ...
We report the results of a low-temperature (300K-15K) high-pressure (up to 22GPa) Raman study of the Verwey transition in magnetite (Fe3O4). We use additional Raman modes observed below the Verwey...
Electronic Raman scattering in Magnetite, Spin vs. Charge gap (2009)
Gasparov, L., Rush, A., Guntherodt, G., Berger, H.
We report Raman scattering data of single crystals of magnetite (Fe3O4) with Verwey transition temperatures (Tv) of 123 and 117K, respectively. Both single crystals reveal broad electronic background...
Her, J. L., Matsuda, Y. H., Suga, K., Kindo, K., Takeyama, S., Berger, H., ...
High-field magnetization, M($H$), on Ni$_{5}$(TeO$_{3}$)$_{4}$X$_{2}$ (X = Br and Cl) were measured by using a pulse magnet. These compounds have a two dimensional crystal structure and a distorted...
Pregelj, M., Zaharko, O., Zorko, A., Kutnjak, Z., Jeglic, P., Brown, P. J., ...
Magnetic and ferroelectric properties of layered geometrically frustrated cluster compound FeTe$_2$O$_5$Br were investigated with single-crystal neutron diffraction and dielectric measurements....
Two energy gaps and Fermi surface 'arcs' in NbSe2 (2009)
Borisenko, S. V., Kordyuk, A. A., Zabolotnyy, V. B., Inosov, D. S., Evtushinsky, D., Buechner, B., ...
Using angle-resolved photoemission spectroscopy (ARPES), we report on the direct observation of the energy gap in 2H-NbSe2 caused by the charge-density waves (CDW). The gap opens in the regions of...
Prester, M., Zivkovic, I., Zaharko, O., Pajic, D., Tregenna-Piggott, P., Berger, H.
Pronounced anisotropy of magnetic properties and complex magnetic order of a new oxi-halide compound Co7(TeO3)4Br6 has been investigated by powder and single crystal neutron diffraction,...
A Methodology for developing MAS as 3D Electronic Institutions (2008)
A. Bogdanovych, M. Esteva, S. Simoff, C. Sierra, H. Berger
Abstract. In this paper we propose viewing Virtual Worlds as open Multiagent Systems and propose the 3D Electronic Institutions methodology for their development. 3D Electronic Institutions are...
Gnezdilov, V., Lemmens, P., Zvyagin, A. A., Cheranovskii, V. O., Lamonova, K., Pashkevich, Yu. G., ...
We report magnetic susceptibility, specific heat, and Raman scattering investigations of alpha-TeVO4 containing V-O edge-sharing chains. These chains promote a system of...
Spontaneous exciton condensation in 1T-TiSe2: a BCS-like approach (2008)
Monney, C., Cercellier, H., Clerc, F., Battaglia, C., Schwier, E. F., Didiot, C., ...
Recently strong evidence has been found in favor of a BCS-like condensation of excitons in 1\textit{T}-TiSe$_2$. Theoretical photoemission intensity maps have been generated by the spectral function...
Inosov, D. S., Evtushinsky, D. V., Zabolotnyy, V. B., Kordyuk, A. A., Buechner, B., Follath, R., ...
Temperature evolution of the 2H-TaSe2 Fermi surface (FS) is studied by high-resolution angle-resolved photoemission spectroscopy (ARPES). High-accuracy determination of the FS geometry was possible...
Fermi surface nesting in several transition metal dichalcogenides (2008)
Inosov, D. S., Zabolotnyy, V. B., Evtushinsky, D. V., Kordyuk, A. A., Buechner, B., Follath, R., ...
By means of high-resolution angle resolved photoelectron spectroscopy (ARPES) we have studied the fermiology of 2H transition metal dichalcogenide polytypes TaSe2, NbSe2, and Cu0.2NbS2. The...
A Methodology for developing MAS as 3D Electronic Institutions (2008)
A. Bogdanovych, M. Esteva, S. Simoff, C. Sierra, H. Berger
Abstract. In this paper we propose viewing Virtual Worlds as open Multiagent Systems and propose the 3D Electronic Institutions methodology for their development. 3D Electronic Institutions are...
A Methodology for Developing Multiagent Systems as 3D Electronic Institutions (2008)
A. Bogdanovych, M. Esteva, S. Simoff, C. Sierra, H. Berger
Abstract. In this paper we propose viewing Virtual Worlds as open Multiagent Systems and propose the 3D Electronic Institutions methodology for their development. 3D Electronic Institutions are...
Interplane coupling in the quasi-two-dimensional 1T-TaS2 (2008)
Bovet, M., Van Smaalen, S., Berger, H., Gaal, R., Forró, L., Schlapbach, L., ...
Density-functional band-structure calculations including atomic displacements in the charge-density wave phase have been performed for the layered 1T-TaS2. This quasi-two-dimensional material...
Pseudogapped Fermi surfaces of 1T-TaS2 and 1T-TaSe2: A charge density wave effect (2008)
Bovet, M., Popovic, D., Clerc, F., Koitzsch, Christian, Probst, U., Bucher, E., ...
We report room temperature angle-resolved photoemission experiments on 1T-TaS2 and 1T-TaSe2 complemented by density-functional theory calculations. Fermi-surface mapping experiments in the...
Pseudogapped Fermi surfaces of 1T-TaS2 and 1T-TaSe2: A charge density wave effect (2008)
Bovet, M., Popovic, D., Clerc, F., Koitzsch, Christian, Probst, U., Bucher, E., ...
We report room temperature angle-resolved photoemission experiments on 1T-TaS2 and 1T-TaSe2 complemented by density-functional theory calculations. Fermi-surface mapping experiments in the...
Interplane coupling in the quasi-two-dimensional 1T-TaS2 (2008)
Bovet, M., Van Smaalen, S., Berger, H., Gaal, R., Forró, L., Schlapbach, L., ...
Density-functional band-structure calculations including atomic displacements in the charge-density wave phase have been performed for the layered 1T-TaS2. This quasi-two-dimensional material...
Multiple scattering investigation of the 1T-TaS2 surface termination (2008)
Despont, Laurent, Clerc, F., Garnier, Michael Bernard Gunnar, Berger, H., Forró, L., Aebi, Philipp
Multiple scattering theory based on a cluster model is used to simulate full hemispherical X-ray photoelectron diffraction measurements on a 1T-TaS2 (0001) surface. Key points to determine the...
Remnant Fermi Surface in the Presence of an Underlying Instability in Layered 1T–TaS2 (2008)
Pillo, Th., Hayoz, J., Berger, H., Grioni, M., Schlapbach, L., Aebi, Philipp
We report high resolution angle-scanned photoemission and Fermi surface (FS) mapping experiments on the layered transition-metal dichalcogenide 1T–TaS2 in the quasicommensurate (metallic) and the...
Evidence for an Excitonic Insulator Phase in 1T–TaS2 (2008)
Cercellier, H., Monney, Claude, Clerc, F., Battaglia, Corsin, Despont, Laurent, Garnier, Michael Bernard Gunnar, ...
We present a new high-resolution angle-resolved photoemission study of 1T–TaS2 in both its room-temperature, normal phase and its low-temperature, charge-density wave phase. At low temperature the...
Multiple scattering investigation of the 1T-TaS2 surface termination (2008)
Despont, Laurent, Clerc, F., Garnier, Michael Bernard Gunnar, Berger, H., Forró, L., Aebi, Philipp
Multiple scattering theory based on a cluster model is used to simulate full hemispherical X-ray photoelectron diffraction measurements on a 1T-TaS2 (0001) surface. Key points to determine the...
Remnant Fermi Surface in the Presence of an Underlying Instability in Layered 1T–TaS2 (2008)
Pillo, Th., Hayoz, J., Berger, H., Grioni, M., Schlapbach, L., Aebi, Philipp
We report high resolution angle-scanned photoemission and Fermi surface (FS) mapping experiments on the layered transition-metal dichalcogenide 1T–TaS2 in the quasicommensurate (metallic) and the...
Evidence for an Excitonic Insulator Phase in 1T–TaS2 (2008)
Cercellier, H., Monney, Claude, Clerc, F., Battaglia, Corsin, Despont, Laurent, Garnier, Michael Bernard Gunnar, ...
We present a new high-resolution angle-resolved photoemission study of 1T–TaS2 in both its room-temperature, normal phase and its low-temperature, charge-density wave phase. At low temperature the...
Spin–orbit splitting in the valence bands of 1T-TaS2 and 1T-TaSe2 (2008)
Clerc, F., Bovet, M., Berger, H., Despont, Laurent, Koitzsch, C., Gallus, O, ...
We perform angle-resolved photoemission spectroscopy on 1T-TaS2 and 1T-TaSe2 using synchrotron radiation. We observe a characteristic splitting of the chalcogen p-derived valence bands along high...
Fermi surface of layered compounds and bulk charge density wave systems (2008)
Clerc, F., Battaglia, Corsin, Cercellier, H., Monney, Claude, Berger, H., Despont, Laurent, ...
A review is given of recent angle-resolved photoemission (ARPES) experiments and analyses on a series of layered charge density wave materials. Important aspects of ARPES are recalled in view of its...
Spin–orbit splitting in the valence bands of 1T-TaS2 and 1T-TaSe2 (2008)
Clerc, F., Bovet, M., Berger, H., Despont, Laurent, Koitzsch, C., Gallus, O, ...
We perform angle-resolved photoemission spectroscopy on 1T-TaS2 and 1T-TaSe2 using synchrotron radiation. We observe a characteristic splitting of the chalcogen p-derived valence bands along high...
Fermi surface of layered compounds and bulk charge density wave systems (2008)
Clerc, F., Battaglia, Corsin, Cercellier, H., Monney, Claude, Berger, H., Despont, Laurent, ...
A review is given of recent angle-resolved photoemission (ARPES) experiments and analyses on a series of layered charge density wave materials. Important aspects of ARPES are recalled in view of its...
Popovic, D., Bovet, M., Berger, H., Aebi, Philipp
The substitution sites of Pb and Dy dopants in the cuprate-type high temperature superconductor Bi2Sr2Ca1Cu2O8+δ are determined by a direct comparison of the angle-scanned X-ray photoelectron...
Popovic, D., Bovet, M., Berger, H., Aebi, Philipp
The substitution sites of Pb and Dy dopants in the cuprate-type high temperature superconductor Bi2Sr2Ca1Cu2O8+δ are determined by a direct comparison of the angle-scanned X-ray photoelectron...
Pillo, Th., Hayoz, J., Schwaller, P., Berger, H., Aebi, Philipp, Schlapbach, L.
The substitution site of Y and Pb in the cuprate-type high temperature superconductor Bi2Sr2Ca1Cu2O8+δ is determined in a very direct and unambiguous way by means of angle-scanned x-ray...
Pillo, Th., Hayoz, J., Schwaller, P., Berger, H., Aebi, Philipp, Schlapbach, L.
The substitution site of Y and Pb in the cuprate-type high temperature superconductor Bi2Sr2Ca1Cu2O8+δ is determined in a very direct and unambiguous way by means of angle-scanned x-ray...
Non-uniform doping across the Fermi surface of NbS2 intercalates (2008)
Battaglia, Corsin, Cercellier, H., Despont, L., Monney, Claude, Prester, M., Berger, H., ...
Magnetic ordering of the first row transition metal intercalates of NbS2 due to coupling between the conduction electrons and the intercalated ions has been explained in terms of Fermi surface...
Non-uniform doping across the Fermi surface of NbS2 intercalates (2008)
Battaglia, Corsin, Cercellier, H., Despont, L., Monney, Claude, Prester, M., Berger, H., ...
Magnetic ordering of the first row transition metal intercalates of NbS2 due to coupling between the conduction electrons and the intercalated ions has been explained in terms of Fermi surface...
Doping-dependent electronic structure of cuprates studied using angle-scanned photoemission (2008)
Schwaller, P., Greber, T., Aebi, Philipp, Singer, J. M., Berger, H., Forró, L., ...
Full k ||-maps of the electronic structure near the Fermi level of differently doped cuprates measured with angle-scanned photoelectron spectroscopy are presented. The valence band maximum of the...
Doping-dependent electronic structure of cuprates studied using angle-scanned photoemission (2008)
Schwaller, P., Greber, T., Aebi, Philipp, Singer, J. M., Berger, H., Forró, L., ...
Full k ||-maps of the electronic structure near the Fermi level of differently doped cuprates measured with angle-scanned photoelectron spectroscopy are presented. The valence band maximum of the...
Excitation energy map of the high-energy dispersion anomalies in cuprates (2008)
Inosov, D. S., Schuster, R., Kordyuk, A. A., Fink, J., Borisenko, S. V., Zabolotnyy, V. B., ...
The anomalous high-energy dispersion of the conductance band in the high-Tc superconductor Pb-Bi2212 has been extensively mapped by angle-resolved photoemission (ARPES) as a function of excitation...
A Methodology for developing MAS as 3D Electronic Institutions (2008)
A. Bogdanovych, M. Esteva, S. Simoff, C. Sierra, H. Berger
Abstract. In this paper we propose viewing Virtual Worlds as open Multiagent Systems and propose the 3D Electronic Institutions methodology for their development. 3D Electronic Institutions are...
Non-monotonic pseudo-gap in high-Tc cuprates (2008)
Kordyuk, A. A., Borisenko, S. V., Zabolotnyy, V. B., Schuster, R., Inosov, D. S., Follath, R., ...
The mechanism of high temperature superconductivity is not resolved for so long because the normal state of cuprates is not yet understood. Here we show that the normal state pseudo-gap exhibits an...
Pseudogap and charge density waves in two dimensions (2008)
Borisenko, S. V., Kordyuk, A. A., Yaresko, A. N., Zabolotnyy, V. B., Inosov, D. S., Schuster, R., ...
Gnezdilov, V., Lemmens, P., Zvyagin, A. A., Cheranovskii, V. O., Lamonova, K., Pashkevich, Y. G., ...
Benchmark Evaluation of the Message-Passing Overhead on Modern Parallel Architectures (2007)
T. Bönisch, M. Resch, H. Berger
this paper. Furthermore all measurements presented here were done with warm-up of the network
Teenage witches: Magical youth and the search for the self (2007)
A popular new image of Witches has arisen in recent years, due largely to movies like The Craft, Practical Magic, and Simply Irresistible and television shows such as Buffy the Vampire Slayer,...
Kezsmarki, I., Gaal, R., Homes, C. C., Sipos, B., Berger, H., Bordacs, S., ...
We have extended the range of the high-pressure optical spectroscopy to the far-infrared region keeping the accuracy of ambient-pressure experiments. The developed method offers a powerful tool for...
Teenage witches: Magical youth and the search for the self (2007)
A popular new image of Witches has arisen in recent years, due largely to movies like The Craft, Practical Magic, and Simply Irresistible and television shows such as Buffy the Vampire Slayer,...
Teenage witches: Magical youth and the search for the self (2007)
A popular new image of Witches has arisen in recent years, due largely to movies like The Craft, Practical Magic, and Simply Irresistible and television shows such as Buffy the Vampire Slayer,...
Drobinski, P., Steinacker, R., Richner, H., Baumann-Stanzer, K., Beffrey, G., Benech, B., ...
Quarterly Journal of the Royal Meteorological Society, 133(2007) S.897-916
Structural and magnetic dimers in the spin-gapped system CuTe2O5 (2006)
Deisenhofer, J., Eremina, R. M., Pimenov, A., Gavrilova, T., Berger, H., Johnsson, M., ...
We investigated the magnetic properties of the system CuTe2O5 by susceptibility and electron spin resonance measurements. The anisotropy of the effective g-factors and the ESR linewidth indicates...
Constituents of the Quasiparticle Spectrum Along the Nodal Direction of High-Tc Cuprates (2006)
Kordyuk, A. A., Borisenko, S. V., Zabolotnyy, V. B., Geck, J., Knupfer, M., Fink, J., ...
Applying the Kramers-Kronig consistent procedure, developed earlier, we investigate in detail the formation of the quasiparticle spectrum along the nodal direction of high-Tc cuprates. The heavily...
Three-dimensional band structure of layered TiTe2: Photoemission final-state effects (2006)
Strocov, V. N., Krasovskii, E. E., Schattke, W., Barrett, N., Berger, H., Schrupp, D., ...
Three-dimensional band structure of unoccupied and occupied states of the prototype layered material TiTe2 is determined focusing on the GammaA line of the Brillouin zone. Dispersions and lifetimes...
Zabolotnyy, V. B., Borisenko, S. V., Kordyuk, A. A., Fink, J., Geck, J., Koitzsch, A., ...
The Cu substitution by Zn and Ni impurities and its influence on the mass renormalization effects in angle-resolved photoelectron spectra (ARPES) of Bi2Sr2CaCu2O8-delta is addressed. We show that the...
Constituents of the Quasiparticle Spectrum Along the Nodal Direction of High-Tc Cuprates (2006)
Kordyuk, A. A., Borisenko, S. V., Zabolotnyy, V. B., Geck, J., Knupfer, M., Fink, J., ...
Zaharko, O., Ronnow, H., Mesot, J., Crowe, S. J., Paul, D. M., Brown, P. J., ...
Polarized and unpolarized neutron-diffraction studies have been carried out on single crystals of the coupled spin tetrahedra systems Cu2Te2O5X2 (X=Cl, Br). A model of the magnetic structure...
Unadulterated spectral function of low-energy quasiparticles in Bi2Sr2CaCu2O8+δ (2006)
Evtushinsky, D. V., Kordyuk, A. A., Borisenko, S. V., Zabolotnyy, V. B., Knupfer, M., Fink, J., ...
Fitting the momentum distribution photoemission spectra to the Voigt profile appears to be a robust procedure to purify the interaction effects from the experimental resolution. In application to...
Separation of Orbital Contributions to the Optical Conductivity of BaVS3 (2006)
Kézsmárki, I., Mihály, G., Gaál, R., Barišić, N., Akrap, A., Berger, H., ...
Spin resonance in the ordered magnetic state of Ni-5(TeO3)(4)Cl-2 (2006)
Mihaly, L, Feher, T, Dora, B, Nafradi, B, Berger, H, Forro, L
The transition metal tellurium oxychloride, Ni-5(TeO3)(4)Cl-2, has been investigated by high-field electron-spin resonance for frequencies up to 3 THz, at temperatures well below the magnetic...
Simeon Simoff, Æ Carles Sierra, H. Berger, M. Dittenbach, M. Dittenbach, D. Merkl, ...
Abstract In this paper we describe an e-Tourism environment that takes a community-driven approach to foster a lively society of travelers who exchange travel experiences, recommend tourism...
Constituents of the Quasiparticle Spectrum Along the Nodal Direction of High-Tc Cuprates (2006)
Kordyuk, A. A., Borisenko, S. V., Zabolotnyy, V. B., Geck, J., Knupfer, M., Fink, J., ...
Applying the Kramers-Kronig consistent procedure, developed earlier, we investigate in detail the formation of the quasiparticle spectrum along the nodal direction of high-Tc cuprates. The heavily...
Richner, H., Baumann-Stanzer, K., Benech, B., Berger, H., Chimani, B., Dorninger, M., ...
Meteorology and Atmospheric Physics, 92(2006) S.255-84
Magnetite: Raman study of the high-pressure and low-temperature effects - art. no. 10A922 (2005)
Gasparov, L. V., Arenas, D., Choi, K. Y., Guntherodt, G., Berger, H., Forro, L., ...
We report the results of a low-temperature (300 K-15 K) high-pressure (up to 22 GPa) Raman study of the Verwey transition in magnetite (Fe3O4). We use additional Raman modes observed below the Verwey...
Incommensurate magnetism in the coupled spin tetrahedra system Cu2Te2O5Cl2 (2005)
Zaharko, O., Ronnow, H. M., Daoud-Aladine, A., Streule, S., Juranyi, F., Mesot, J., ...
Neutron scattering studies on powder and single crystals have provided new evidence for unconventional magnetism in Cu2Te2O5Cl2. The compound is built from tetrahedral clusters of S=1/2 Cu2+ spins...
Jaubert, G., Bougeault, P., Berger, H., Chimani, B., Flamant, C., Häberli, C., ...
Quarterly Journal of the Royal Meteorological Society, 131(2005) S.1339-61
The superfluid density of the cuprate superconductors estimated using infrared spectroscopy. (2005)
Tanner, D.B., Gao, F., Kamaras, K., Liu, H.L., Quijada, M.A., Romero, D.B., ...
2004 University of Miami Workshop on Unconventional Superconductivity, Miami, Fla., January 11-16, 2004
Kordyuk, A. A., Borisenko, S. V., Koitzsch, A., Fink, J., Knupfer, M., Büchner, B., ...
Studying the nodal quasiparticles in superconducting cuprates by photoemission with highly improved momentum resolution, we show that a new "kink" feature in the scattering rate is a key to uncover...
Origin of the shadow Fermi surface in Bi-based cuprates (2004)
Koitzsch, A., Borisenko, S. V., Kordyuk, A. A., Kim, T. K., Knupfer, M., Fink, J., ...
We used angle-resolved photoemission spectroscopy to study the shadow Fermi surface in one layer Bi2Sr1.6La0.4CuO6+delta and two layer (Bi,Pb)(2)Sr2CaCu2O8+delta. We find the shadow band to have the...
Superconductors: Time-reversal symmetry breaking? (2004)
Borisenko, S. V., Kordyuk, A. A., Koitzsch, A., Knupfer, M., Fink, J., Berger, H., ...
Excitation energy dependence of the ARPES intensity in Pb-doped and pristine Bi2Sr2CaCu2O8+δ (2004)
Borisenko, S. V., Kim, T. K., Kordyuk, A. A., Knupfer, M., Fink, J., Gayone, J. E., ...
Evidence for CuO conducting band splitting in the nodal direction of Bi2Sr2CaCu2O8+δ (2004)
Kordyuk, A. A., Borisenko, S. V., Yaresko, A. N., Drechsler, S. L., Rosner, H., Kim, T. K., ...
Evidence for CuO conducting band splitting in the nodal direction of Bi2Sr2CaCu2O8+δ (2004)
Kordyuk, A. A., Borisenko, S. V., Yaresko, A. N., Rosner, H., Kim, T. K., ...
Kordyuk, A. A., Borisenko, S. V., Koitzsch, A., Fink, J., Knupfer, M., Buchner, B., ...
Studying the nodal quasiparticles in superconducting cuprates by photoemission with highly improved momentum resolution, we show that a new "kink" feature in the scattering rate is a key to uncover...
Ocko, M, Zivkovic, I, Prester, M, Drobac, D, Ariosa, D, Berger, H, ...
We report on AC susceptibility, resistivity, thermopower and measurements of sintered magnetic superconductor RuSr2GdCu2O8. The anti ferromagnetic phase transition at 133 K is seen clearly in the AC...
Where does 98% of the superfluid spectral weight in the cuprates come from? (2003)
Tanner, D.B., Gao, F., Gasparov, L.V., Kamaras, K., Liu, H.L., Quijada, M.A., ...
March Meeting of the American Physical Society, Austin, Tex., March 3-7, 2003
Jaubert, G., Benech, B., Berger, H., Chimani, B., Flamant, C., Haeberli, C., ...
Internat.Conf.on Alpine Meteorology and the Mesoscale Alpine Programme Meeting (ICAM/MAP2003), Brig, CH, May 19-23, 2003
Coexistence of ferromagnetism and high-temperature superconductivity in Dy-doped BiPbSrCaCuO (2002)
Berger, H., Ariosa, D., Gaal, R., Saleh, A., Margaritondo, G., Lee, S. F., ...
Ferromagnetism was found to coexist with superconductivity in Dy-doped BiPbSrCaCuO-2212 single crystals up to the superconducting critical temperature T-c similar to 80 X. Several experimental tests...
Phonon anomaly at the charge ordering transition in 1T-TaS2 (2002)
Gasparov, L. V., Brown, K. G., Wint, A. C., Tanner, D. B., Berger, H., Margaritondo, G., ...
The infrared reflectance of the transition-metal chalcogenide 1T-TaS2 has been measured at temperatures from 30 K to 360 K over 30-45 000 cm(-1) (4 meV-5.5 eV). The optical conductivity was obtained...
Quasiparticle scattering processes in a model Fermi liquid: 1T-TiTe2 (2002)
Perfetti, L., Rojas, C., Reginelli, A., Gavioli, L., Berger, H., Margaritondo, G., ...
We performed angle-resolved photoelectron spectroscopy (ARPES) and resistivity measurements on the layered metal 1T-TiTe2. We determined the quasiparticle dispersion and lifetime. In particular, we...
Ruthenocuprates RuSr2(Eu,Ce)(2)Cu2O10-y: Intrinsic magnetic multilayers (2002)
Zivkovic, I., Hirai, Y., Frazer, B. H., Prester, M., Drobac, D., Ariosa, D., ...
We report ac susceptibility data on RuSr2(Eu,Ce)(2)Cu2O10-y (Ru-1222, Ce content x=0.5 and 1.0), RuSr2GdCu2O8 (Ru-1212), and SrRuO3. Both Ru-1222 (x=0.5, 1.0) sample types exhibit unexpected magnetic...
Zivkovic, I, Drobac, D, Ariosa, D, Berger, H, Pavuna, D, Prester, M
We have measured two structurally similar superconducting systems, RuSr2GdCu2O8 and GdBa2Cu3O7 by means of high-resolution ac susceptibility. The real and the imaginary part of ac susceptibility of...
Ariosa, D., Berger, H., Schmauder, T., Pavuna, D., Margaritondo, G., Christensen, S., ...
We report on a distortion of Bi2Sr2CanCun+1 O6+2n+x (n = 0,1) single crystals, perpendicular to the CuO2 planes (the c-axis), for non-stoichiometric samples containing an excess of Bi. The distortion...
The spectroscopic properties of 1D Peierls systems (2001)
Grioni, M., Perfetti, L., Rojas, C., Berger, H., Margaritondo, G., Voit, J., ...
We have studied by high resolution ARPES the spectroscopic properties of the prototype charge density wave system (TaSe4)(2)I and of the closely related insulating compound (NbSe4)(3)I. We observe...
Perfetti, L., Berger, H., Reginelli, A., Degiorgi, L., Hochst, H., Voit, J., ...
Angle-resolved photoemission (ARPES) on the quasi-one-dimensional conductor (TaSe4)(2)I shows a hidden Fermi-surface crossing in its metallic state and the opening of a Peierls gap at low...
Perfetti, L., Rojas, C., Reginelli, A., Gavioli, L., Berger, H., Margaritondo, G., ...
We present a combined angle-resolved photoemission spectroscopy and resistivity study of the model Fermi liquid system 1T-TiTe2. From the analysis of the quasiparticle spectral line shape we identify...
Superfluid and normal-fluid density in the cuprate superconductors (2001)
Tanner, D. B., Gao, F., Kamaras, K., Liu, H. L., Quijada, M. A., Romero, D. B., ...
As carriers are introduced into the cuprates (by doping the insulating "parent" compounds) spectral weight appears in the optical spectrum at photon energies below the charge-transfer gap. This...
Superfluid and normal-fluid densities in the high-T§c superconductors. (2001)
Tanner, D.B., Gao, F., Kamaris, K., Liu, H.L., Quijada, M.A., Romero, D.B., ...
Proc.of the 6th Internat.Conf.on Materials and Mechanisms of Superconductivity High Temperature Superconductors (M2S-HTSC), Houston, Tex., February 20-25, 2000
Infrared and Raman studies of the Verwey transition in magnetite (2000)
Gasparov, L. V., Tanner, D. B., Romero, D. B., Berger, H., Margaritondo, G., Forro, L.
We present infrared and Raman measurements of magnetite (Fe3O4). This material is known to undergo a metal-insulator and a structural transition (Verwey transition) at T-V = 120 K. The structural...
Temperature-dependent photoemission features for overdoped Bi2Sr2CaCu2O8+x cuprates (2000)
Rast, S., Frazer, B. H., Onellion, M., Schmauder, T., Abrecht, M., Touzelet, O., ...
We report temperature-dependent angle-resolved photoemission spectra for overdoped Bi2Sr2CaCu2O8+alpha single-crystal samples. The data indicate that there is a special temperature (T+) where the...
Superfluid and normal-fluid densities in the high-T-c superconductors (2000)
Tanner, D. B., Gao, F., Kamaras, K., Liu, H. L., Quijada, M. A., Romero, D. B., ...
In clean metallic superconductors, 100% of the mobile carriers participate ill the condensate, so that the London penetration depth (which measures the electromagnetic screening by the...
On some common features in high and low-Tc superconducting perovskites (2000)
Vobornik, I., Ariosa, D., Berger, H., Forro, L., Gatt, R., Grioni, M., ...
Recent photoemission evidence for non-zero gap in highly overdoped Bi2Sr2-CaCu2O8+x, along the directions in the Brillouin zone where the d-wave gap exhibits nodes, is in accordance with more...
Vobornik, I., Berger, H., Grioni, M., Margaritondo, G., Forro, L., Rullier-Albenque, F.
Disorder has a strong influence on the spectral properties of the Bi2Sr2CaCu2O8+x high-T-c superconductor, both in the normal and in the superconducting state. High-resolution photoemission reveals a...
Disorder effects in cuprates (2000)
Vobornik, I., Grioni, M., Berger, H., Forro, L., Pavuna, D., Margaritondo, G., ...
We report on ah-plane resistivity (rho) and angle-reserved photoemission (ARPES) spectra for Bi2Sr2CaCu2O8+x single crystals irradiated with neutrons or electron-beam irradiation. Both the normal and...
Electronic structure of solids with competing periodic potentials (2000)
Voit, J., Perfetti, L., Zwick, F., Berger, H., Margaritondo, G., Gruner, G., ...
When electrons are subject to a potential with two incommensurate periods, translational invariance is lost, and no periodic band structure is expected. However, model calculations based on nearly...
Crossovers in the out-of-plane resistivity of superconducting Tl2Ba2CaCu2O8 single crystals (2000)
Salvetat, JP, Berger, H, Halbritter, A, Mihaly, G, Pavuna, D, Forro, L
We report the in-plane (rho (ab)) and out-of-plane (rho (c)) resistivities in the 4-800 K range on single crystals of Tl2Ba2CaCu2O8 high-T-c cuprate with T-c = 111 K (rho (c)/rho (ab) approximate to...
Inhomogeneous and thickness-dependent chemical reactivity at GaSe-Si interfaces (1999)
Almeida, J., Zacchigna, M., Berger, H., Margaritondo, G.
Scanning photoelectron spectromicroscopy experiments on the edge of patterned Si overlayers on GaSe revealed the presence of an inhomogeneous reaction with a metallic-like Ga phase separation. The...
The development and application of imaging EXAFS spectromicroscopy (1999)
Hwu, Y., Tsai, W. L., Chang, L. W., Chen, C. H., Wu, C. C., Noh, D. Y., ...
The capability to perform absorption spectroscopy with hard x-rays was added to the synchrotron imaging spectromicroscopy technique. We present several successful test cases. First, the EXAFS...
Liu, H. L., Quijada, M. A., Tanner, D. B., Berger, H., Margaritondo, G.
We report on the ab-plane polarized reflectance of an untwinned (Bi1.57Pb0.43)Sr2CaCu2O8+delta single crystal over the frequency range from 80 to 32 000 cm(-1) (10 meV-4 eV) at temperatures between...
Doping-induced change of optical properties in underdoped cuprate superconductors (1999)
Liu, H. L., Quijada, M. A., Zibold, A. M., Yoon, Y. D., Tanner, D. B., Cao, G., ...
We report on the ab-plane optical reflectance measurements of single crystals of Y-doped Bi2Sr2CaCu2O8+delta and Pr-doped YBa2Cu3O7-delta over a wide frequency range from 80 to 40 000 cm(-1) (10...
Liu, H. L., Tanner, D. B., Berger, H., Margaritondo, G.
We report on the ab-plane optical reflectance of an iodine-intercalated Bi1.9Pb0.1Sr2CaCu2O8+delta single crystal in the 80-40000 cm(-1) (10 meV-5 eV) frequency range and at temperatures between 10...
ab-plane optical properties of Ni-doped Bi2Sr2CaCu2O8+delta (1999)
Liu, H. L., Tanner, D. B., Berger, H., Margaritondo, G.
The ab-plane optical reflectance of single crystal of Bi2Sr2Ca(Cu1-xNix)(2)O8+d, for x = 0.0215, has been measured from 80 to 40 000 cm(-l) (10 meV-5 eV) and at temperatures between 20 and 300 K....
Doping dependence of electronic structure in Bi2Sr2CaCu2O8+x (1999)
Onellion, M., Christensen, S., Frazer, B., Gatt, R., Kelley, R. J., Misra, S., ...
We report on angle-resolved photoemission and superconductor-insulator-superconductor tunneling measurements of the normal and superconducting states of Bi2Sr2CaCu2O8+x single crystal samples and...
Anisotropy in the ab-plane optical properties of Bi2Sr2CaCu2O8 single-domain crystals (1999)
Quijada, M. A., Tanner, D. B., Kelley, R. J., Onellion, M., Berger, H., Margaritondo, G.
The ab-plane optical properties of the high-temperature superconductor Bi2Sr2CaCu2O8 are anisotropic in both the normal and the superconducting state. Consistent with the orthorhombic structure, the...
Vobornik, I., Berger, H., Margaritondo, G., Rullier-Albenque, F., Forro, L., Grioni, M.
We investigated the effects of disorder in Bi2Sr2CaCu2O8+x high temperature superconductor. We found that small defect densities already suppress the characteristic spectral signature of the...
Spectroscopic signatures of defect-induced pair breaking in Bi2Sr2CaCu2O8+x (1999)
Vobornik, I., Berger, H., Pavuna, D., Onellion, M., Margaritondo, G., Rullier-Albenque, F., ...
We investigated the effect of disorder on the spectral properties of the high temperature superconductor Bi2Sr2CaCu2O8+x. We find that small defect densities, in the low 10(-3) range, already...
Defect-induced changes in the spectral properties of high-Tc cuprates (1999)
Vobornik, I., Berger, H., Rullier-Albenque, F., Margaritondo, G., Pavuna, D., Forro, L., ...
Superconductivity in high-Tc cuprates is particularly sensitive to disorder due to the unconventional d-wave pairing symmetry. We investigated effects of disorder on the spectral properties of...
Zacchigna, M., Berger, H., Sirigu, L., Margaritondo, G., Lorusso, G. F., Solak, H., ...
We performed a spectromicroscopy experiment to find evidence of lateral inhomogeneities in the band bending for the Al/GaS system. Microimages of the interface tuned on the Al 2p con levels revealed...
Coexisting one-dimensional and three-dimensional spectral signatures in TaTe4 (1999)
Zwick, F., Berger, H., Grioni, M., Margaritondo, G., Forro, L., LaVeigne, J., ...
Using angle-resolved photoemission spectroscopy, we probe the electronic band structure of TaTe4 single crystal samples. Resistivity and optical measurements were also performed on the same samples....
Photoemission study of organic and inorganic CDW-systems (1999)
Zwick, F., Berger, H., Grioni, M., Margaritondo, G., Onellion, M.
We investigate by means of high resolution angular resolved photoemission spectroscopy the classical one-dimensional organic conductor TTF-TCNQ and the inorganic one-dimensional conductor...
Pavuna, D, Berger, H, Forro, L
We present the resistivity measurements on single crystals of Sr2RuO4-delta, grown by the flux technique. We discuss the striking, linear temperature dependence of resistivity that persists up to...
Schottky barrier and interface formation of metal-GaTe(001) interfaces (1998)
Almeida, J., Berger, H., Margaritondo, G.
We studied the deposition of Au, In, Ag, and Al overlayers onto clean-cleaved GaTe(001) surfaces at room temperature by x-ray photoelectron spectroscopy. Gold and In overlayers did not produce...
X-trap influence on luminescence and electric properties of C-60 single crystal (1998)
Kolmakov, A., Stankevitch, V., Svechnikov, N., Dudin, P., Artemiev, N., Berger, H., ...
This paper is devoted to investigation of luminescence and some electric properties of C-60 single crystal and their connection with X-traps model. Luminescence properties for C-60 single crystal,...
The growth and properties of single crystals of GaInTe2, a ternary chalcogenide semiconductor (1998)
Mobarak, M., Berger, H., Lorusso, G. F., Capozzi, V., Perna, G., Ibrahim, M. M., ...
Single crystals of GaInTe2 were grown from a melt and characterized by various experimental techniques, such as x-ray diffraction, x-ray photoelectron spectroscopy (XPS), and electrical and...
Pavuna, D., Ariosa, D., Berger, H., Christensen, S., Frazer, B., Gatt, R., ...
Due to imperfect surfaces of most cuprate samples, almost all photoemission studies in the past decade were performed on Bi2Sr2CaCu2O8+x, even though a large fraction of other studies and electronic...
Band discontinuity fluctuations and local chemistry at the GaSe-Si interface (1998)
Zacchigna, M., Sirigu, L., Almeida, J., Berger, H., Gregoratti, L., Marsi, M., ...
Photoemission spectromicroscopy data on Si-GaSe with 0.2 mu m lateral resolution revealed laterally inhomogeneous interface Se-Si chemical reactions. The local Si 2p fits agrees with interface Si...
Spectral consequences of broken phase coherence in 1T-TaS2 (1998)
Zwick, F., Berger, H., Vobornik, I., Margaritondo, G., Forro, L., Beeli, C., ...
Random defects destroy long-range phase coherence, and inhibit the metal-insulator transition in the charge density wave (CDW) system 1T-TaS2. Photoelectron spectroscopy with high resolution reveals...
Spectral consequences of broken phase coherence in 1T-TaS/sub 2/ (1998)
Zwick, F, Berger, H, Vobornik, I, Margaritondo, G, Forro, L, Beeli, C, ...
Random defects destroy long-range phase coherence, and inhibit the metal-insulator transition in the charge density wave (CDW) system IT-TaS/sub 2/. Photoelectron spectroscopy with high resolution...
On linear resistivity from ~1 to 103 K in Sr2RuO4-δ single crystals grown by flux technique (1998)
Berger, H, Forro, L, Pavuna, D
We report transport measurements on single crystals of Sr2RuO4-δ, grown by the flux technique. The temperature dependence of the Hall coefficient is similar to the one measured in cuprates, and the...
HematoWork: A Knowledge-Based Workflow System for Distributed Cancer Therapy (1998)
R. Müller, B. Heller, M. Löffler, A. Winter, R. Speer, H. Berger, ...
The domain of hemato-oncology is characterized by a complex patient management and the involvement of several institutions (e.g. oncological ward, private practitioner, external review panels) in the...
Interface formation and chemical reactions on metal-GaTe(001) surfaces (1997)
Almeida, J., Berger, H., Margaritondo, G.
We studied using x-ray photoelectron spectroscopy the deposition of Au, In, Ag and Al overlayers onto clean-cleaved GaTe(001) surfaces at room temperature. The first steps of the Schottky barrier...
Spectromicroscopic evidence of Ge-GaSe chemical reactions: Not a Schottky system (1997)
Almeida, J., Vobornik, I., Berger, H., Kiskinova, M., Kolmakov, A., Marsi, M., ...
Photoelectron-spectromicroscopy experiments unexpectedly revealed a reacted phase for Ge overlayers on GaSe. This finding is in sharp contrast with the notion that this interface is an ideal Schottky...
Doping effects on the electronic structure of CuO2 planes (1997)
Grioni, M., Berger, H., Larosa, S., Vobornik, I., Zwick, F., Margaritondo, G., ...
We have exploited angle-resolved photoelectron spectroscopy to study changes in the quasiparticle excitations of CuO2 planes as a function of the carrier density, in optimally doped and underdoped...
Electronic structure of CuO2 planes: From insulator to superconductor (1997)
LaRosa, S., Vobornik, I., Zwick, F., Berger, H., Grioni, M., Margaritondo, G., ...
Using angle-resolved photoemission and linearly polarized synchrotron radiation, we measured the electronic band structure of electronic states of CuO2 plane materials ranging from insulators...
The growth and characterization of GaInSe2 single crystals (1997)
Mobarak, M., Berger, H., Lorusso, G. F., Capozzi, V., Perna, G., Ibrahim, M. M., ...
GalnSe(2) single crystals have been grown and characterized by experimental techniques such as high-resolution transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy...
Temperature dependence of electronic states in (TaSe4)(2)I - Reply (1997)
Terrasi, A., Marsi, M., Berger, H., Margaritondo, G., Kelley, R. J., Onellion, M.
We reject the assertion of Claessen et al., confirm the validity of our data, and discuss possible causes for the disagreement.
Morphology of growth of Bi§2Sr§2CaCu§2O§8 single crystals. (1997)
Indenbom, M.V., Van Der Beek, C.J., Berseth, V., Wolf, T., Berger, H., Benoit, W.
3rd Internat.Conf.on Physics and Chemistry of Molecular and Oxide Superconductors, Karlsruhe, August 2-8, 1996
Spectromicroscopy study of lateral band bending of the Ge-GaSe heterostructure (1996)
Almeida, J., Vobornik, I., Berger, H., Kiskinova, M., Kolmakov, A., Marsi, M., ...
We report a study of the lateral band bending at the Ge-GaSe interface. Spectromicroscopy measurements with synchrotron radiation were performed at the ESCA microscopy line of ELETTRA in Ge patterned...
Progress in understanding VUV photoemission in low-dimensionality systems (1996)
Berger, H., LaRosa, S., Terrasi, A., Marsi, M., Collins, I., Kelley, R. J., ...
High-resolution angle-resolved photoemission and core-level photoemission measurements were performed on single crystal samples of the quasi-one-dimensional material (TaSe4)(2)I and the cuprate...
On the electronic properties of the quasi-one-dimensional crystal Nb4Te17I4 (1996)
Berger, H., Marsi, M., Margaritondo, G., Forro, L., Beeli, C., Crotti, C., ...
We studied the newly synthesized quasi-one-dimensional compound Nb4Te17I4. Resistivity measurements confirmed its pseudo-one-dimensional character and photoemission spectroscopy clarified the nature...
Doping-induced change of superconducting gap anisotropy in Bi2Sr2Ca1Cu2O8+delta (1996)
Kelley, R. J., Quitmann, C., Onellion, M., Berger, H., Almeras, P., Margaritondo, G.
High-resolution angle-resolved photoemission measurements were performed on single crystals of Bi2Sr2Ca1Cu2O8+delta with different oxygen stoichiometries. The data establish that the gap anisotropy...
Temperature dependence of luminescence intensity and decay times in C-60 single crystal (1996)
Kolmakov, A., Stankevitch, V., Svechnikov, N., Dudin, P., Artemev, N., Berger, H., ...
Luminescence properties for C-60 single crystal, the temperature dependence of the luminescence spectra and decay kinetics were measured for a wide range of excitation energies. At low temperatures...
Localization effects in Co- and Ni-doped Bi2Sr2CaCu2O8+gamma (1996)
Quitmann, C., Almeras, P., Ma, J., Kelley, R. J., Berger, H., Cai, X. Y., ...
We have studied the influence of Co and Ni doping on the electronic band structure and the transport properties of high-temperature superconductors. The doping has dramatic effects on both the normal...
Effects of lithium intercalation on the electronic properties of FePS3 single crystals (1996)
Silipigni, L., Calareso, C., Curro, G. M., Neri, F., Grasso, V., Berger, H., ...
The reaction of FePS3 single crystals with a 1.6M n-butyl lithium solution in n-hexane has been followed through de electrical conductivity measurements as a function of the intercalation time. In...
Incomplete charge-density-wave gap opening in orthorhombic Mo4O11 (1996)
Terrasi, A., Marsi, M., Berger, H., Gauthier, F., Forro, L., Margaritondo, G., ...
Using angle-resolved photoemission, we report the first observation of an incomplete charge-density-wave (CDW) gap opening for the quasi-two-dimensional material Mo4O11. Our data indicate that the...
On the electronic properties of the quasi-one-dimensional crystal Nb/sub 4/Te/sub 17/I/sub 4/ (1996)
Berger, H, Marsi, M, Margaritondo, G, Forro, L, Beeli, C, Crotti, C, ...
Exploring determinants of perceived interfirm dependence in industrial supplier relations (1995)
Noorderhaven, N.G., Nooteboom, B., Berger, H.
Three groups of sources of supplier dependence are discussed in the literature: factors related to goal mediation, factors related to relation-specific assets, and factors related to network...
Recent Results on the Properties of Csi Photocathodes (1995)
Berger, H., Besson, P., Bourgeois, P., Braem, A., Breskin, A., Buzulutskov, A., ...
We report here on the results obtained by the CERN RD26 collaboration on the production and characterization of large area photocathodes, susceptible to equip fast UV-photon imaging devices. Such...
Microscopic-Scale Lateral Inhomogeneities of the Gase-Ge Heterojunction Energy Lineup (1995)
Gozzo, F., Berger, H., Collins, I. R., Margaritondo, G., Ng, W., Raychaudhuri, A. K., ...
Hwu, Y., Tung, C. Y., Pieh, J. Y., Lee, S. D., Almeras, P., Gozzo, F., ...
The first photoelectron spectromicroscopy experiments at the new 1.3 GeV ultrabright X-ray source of SRRC have produced interesting results concerning chemical and topographic features in three types...
Observation of a Vanhove Singularity in Bi2sr2cacu2o8+X with Angle-Resolved Photoemission (1995)
Ma, J., Quitmann, C., Kelley, R. J., Almeras, P., Berger, H., Margaritondo, G., ...
Temperature-Dependence of the Superconducting Gap Anisotropy in Bi2sr2cacu2o8+X (1995)
Ma, J., Quitmann, C., Kelley, R. J., Berger, H., Margaritondo, G., Onellion, M.
Detailed data on the momentum-resolved temperature dependence of the superconducting gap of Bi2Sr2CaCu2O8+x are presented, complemented by similar data on the intensity of the photoemission...
Quitmann, C., Almeras, P., Ma, J. A., Kelley, R. J., Berger, H., Margaritondo, G., ...
Doping Bi2Sr2Ca1Cu2O8+y with Co causes a superconductor-insulator transition. We study correlations between changes in the electrical resistivity rho(ab)(T) and the electronic bandstructure using...
Temperature-Dependence of Electronic States in (Tase4)(2)I (1995)
Terrasi, A., Marsi, M., Berger, H., Margaritondo, G., Kelley, R. J., Onellion, M.
Angle-resolved photoemissions studies were conducted on single-crystal (TaSe4)(2)I samples above and below the charge-density-wave transition temperature (T-CDW) of 260 K. We observed a shift of the...
Complete Fermi surface mapping of Bi-cuprates (1995)
Aebi, P, Osterwalder, J, Schwaller, P, Berger, H, Beeli, C, Schlapbach, L
Fermi surface mapping of high T/sub c/ materials on the basis of angle-scanned photoemission (1995)
Aebi, P, Schlapbach, L, Schwaller, P, Osterwalder, J, Berger, H, Beeli, C
Development of large-area fast RICH prototypes with pad readout and solid photocathodes (1994)
Almeida, J, Berger, H, Braem, André, Coluzza, C, Di Mauro, A, Ljubicic, A, ...
Development of Large-Area Fast-Rich Prototypes with Pad Readout and Solid Photocathodes (1994)
Almeida, J., Berger, H., Braem, A., Coluzza, C., Dimauro, A., Ljubicic, A., ...
In the frame of the RD26 collaboration at CERN we have built and tested several prototypes of fast-RICH detectors suitable for the construction of large systems. The detectors used a solid...
Co-doped Bi2Sr2CaCu2Ox: Anderson localization and superconductivity (1994)
Almeras, P., Berger, H., Ma, J. A., Quitmann, C., Onellion, M., Margaritondo, G.
Cobalt-doping of Bi2Sr2CaCu2Ox beyond a critical level of 1.5-1.7 at % produces both a large decrease in the superconducting transition critical temperature and all of the classic symptoms of...
Photoemission Spectroscopy of Composition and Doping of High-Temperature Superconductors (1994)
Almeras, P., Berger, H., Margaritondo, G., Ma, J., Onellion, M.
Study of Iodine-Intercalated Bi2sr2cacu2oy Single-Crystals (1994)
Almeras, P., Berger, H., Perez, L., Margaritondo, G.
Iodine intercalation in Bi2Sr2CaCu2Oy crystals enables one to modify the critical temperature, T(c), of the superconducting phase, and to obtain a semiconductor phase. This doping drastically changes...
Spatially-Resolved X-Ray Spectroscopy of Csi Deposits (1994)
Coluzza, C., Almeida, J., Berger, H., Perez, L., Margaritondo, G., Paic, G., ...
Using the X-ray spectromicroscopy technique, we studied the primary and secondary electron photoemission of cesium iodide (CsI) films deposited on different substrates, such as copper, aluminum,...
Spatially Localized Energy Shifts in the Photoemission Spectroscopy of Insulators (1994)
Coluzza, C., Almeida, J., Dellorto, T., Gozzo, F., Almeras, P., Berger, H., ...
Core-level photoemission peaks taken on several insulators with spatial resolution of 30-300 mu m rigidly shift in energy from place to place, most likely because of local charging effects. Such...
Effect of Iodine Doping on Bi2sr2ca1cu2ox - Charge-Transfer or Interlayer Coupling (1994)
Jian, M., Almeras, P., Kelley, R. J., Berger, H., Margaritondo, G., Umezawa, A., ...
A comparative study has been made of iodine-intercalated Bi2Sr2Ca1Cu2Ox single crystal and 1 atm O2 annealed Bi2Sr2Ca1Cu1Ox single crystal using an AC susceptibility measurement, X-ray photoemission...
Temperature-Dependence of the Superconducting Condensate and Gap in Bi2sr2ca1cu2o8+X (1994)
Ma, J. A., Quitmann, C., Kelley, R. J., Almeras, P., Berger, H., Margaritondo, G., ...
Using high energy resolution angle-resolved photoemission, we have measured both the superconducting gap and the photoemission superconducting condensate spectral area of Bi2Sr2Ca1Cu1O8+x as a...
Electronic-Structure of Anatase Tio2 Oxide (1994)
Sanjines, R., Tang, H., Berger, H., Gozzo, F., Margaritondo, G., Levy, F.
Photoemission spectromicroscopy was used to investigate the electronic structure of TiO2 anatase single crystals and polycrystalline thin films. The stoichiometry and the degree of oxidation of...
Berger, H., Lavorel, B., Millot, G.
No abstract available
Berger, H., Lavorel, B., Millot, G.
No abstract available
Preventie: hoe blijft een mens gezond? (1993)
Berger, H., Brouwer, A., Lagaay, A.M., Mulder, J.D., Remarque, E.J., ...
The Effect of Yttrium on the Ca and Sr Planes of Y-Doped Bi2sr2ca1cu2o8 (1993)
Almeras, P., Berger, H., Margaritondo, G.
Photoemission spectromicroscopy experiments on a series of Y-doped Bi2Sr2Ca1Cu2O8 single crystals show that the doping changes the valence of copper as required for the observed modification of the...
7ni-O Chemical Interaction and the Transition-Temperature of Ni-Doped Bi2sr2ca1cu2o8 (1993)
Almeras, P., Keszei, B., Berger, H., Forro, L., Margaritondo, G., Bussy, F.
We find that even very low Ni doping levels of high-quality Bi2Sr2Ca1Cu2O8 single crystals strongly affect the transition temperature T(c). We also observed that T(c) is not related to the total Ni...
High-Resolution Tests of Low-Dimensionality Effects in Photoemission (1993)
Coluzza, C., Berger, H., Almeras, P., Gozzo, F., Margaritondo, G., Indlekofer, G., ...
High-energy-resolution photoemission spectra, taken on three quasi-one-dimensional crystals, TaTe4, NbTe4, and (NbSe4)3I confirm the general phenomenon of the suppression of the photoemission...
Microscopic-Scale Lateral Inhomogeneities of the Schottky-Barrier-Formation Process (1993)
Gozzo, F., Marsi, M., Berger, H., Margaritondo, G., Ottolenghi, A., Raychaudhuri, A. K., ...
The interpretation of photoemission-spectromicroscopy studies of Au on GaSe requires a revision of established ideas about this interface, which has long been considered a prototype of Schottky-like...
Lifetime Broadening in Bulk Photoemission Spectroscopy - Reply (1993)
Hwu, Y., Lozzi, L., Larosa, S., Onellion, M., Almeras, P., Gozzo, F., ...
The comment by Starnberg, Brauer, and Nilsson qualitatively identifies the final-state lifetime as the cause of the ''anomalous'' photoemission broadening, but it neglects the linear energy...
Photoemission Response of Bi2sr2cacu2ox - the Normal-State Anisotropy Is Intrinsic (1993)
Kelley, R. J., Ma, J., Onellion, M., Marsi, M., Almeras, P., Berger, H., ...
Angle-resolved, synchrotron-radiation photoemission and low-energy electron-diffraction studies of single-crystal Bi2Sr2CaCu2Ox high-temperature superconductors establish that the [100] and [010]...
Wendland: Analysis of a FEM/BEM coupling method for transonic flow computations (1993)
H. Berger, G. Warnecke, W. L. Wendland
This work is dedicated to Professor Dr. Klaus Kirchgassner on the occasion of his 60th birthday Abstract. A sensitive issue in numerical calculations for exterior flow problems, e.g. around airfoils,...
Wendland: Analysis of a FEM/BEM coupling method for transonic flow computations (1993)
H. Berger, G. Warnecke, W. L. Wendland
Abstract. A sensitive issue in numerical calculations for exterior flow problems, e.g. around airfoils, is the treatment of the far field boundary conditions on a computational domain which is...
Luminescence of high-temperature single-crystal superconductors cleaved in ultrahigh vacuum. (1993)
Stankevitch, V.G., Svechnikov, N.Yu., Kaznacheev, K.V., Kamada, M., Tanaka, S., Hirose, S., ...
Physical Review B, 47(1993) S.1024-28
Photoemission near the Fermi Energy in One Dimension (1992)
Hwu, Y., Almeras, P., Marsi, M., Berger, H., Levy, F., Grioni, M., ...
Angle-resolved photoemission spectra taken with high energy resolution on the one-dimensional compound (TaSe4)2I confirm the suppression of the spectral intensity at the Fermi edge for...
Hwu, Y., Lozzi, L., Larosa, S., Onellion, M., Almeras, P., Gozzo, F., ...
We measured at high energy and angular resolution the spectral width of photoemission features near the Fermi energy for Ag(100) and for the nearly-two-dimensional metal 2H-NbSe2. The results do not...
Substitutional Reactions in the Surface-Chemistry of Bicasrcuo (1991)
Hwu, Y., Lozzi, L., Larosa, S., Marsi, M., Onellion, M., Berger, H., ...
We identified the nature of the chemical reaction between silver and the cleaved surface of BiCaSrCuO at room temperature as a Bi-Ag reaction with Bi segregation, accompanied by interaction with the...
Bicasrcuo-Semiconductor Interface Formation Processes (1991)
Hwu, Y., Lozzi, L., Larosa, S., Marsi, M., Onellion, M., Berger, H., ...
The deposition of Si and Ge on single-crystal 2212 BiCaSrCuO was studied with synchrotron-radiation photoemission. Contrary to previous results on polycrystalline substrates, clear evidence was found...
Evidence for Surface Chemical-Reactions between Gold and Bicasrcuo (1991)
Hwu, Y., Lozzi, L., Larosa, S., Onellion, M., Berger, H., Gozzo, F., ...
We explored the reactivity of gold on cleaved 2212 BiCaSrCuO by synchrotron-radiation photoemission spectroscopy. We found no evidence for reactivity when the substrate was at room temperature,...
Electronic-Spectrum of the High-Temperature Superconducting State (1991)
Hwu, Y., Lozzi, L., Marsi, M., Larosa, S., Winokur, M., Davis, P., ...
Improved experimental conditions enabled us to increase the signal-to-noise ratio of the photoemission spectra for the superconducting state of Bi2Ca2SrCu2O8, taken with high angular and energy...
Microstructure and electrical properties of pure 110 K phase in the BiPbSrCaCuO system (1991)
Holguin, E, Berger, H, Levy, F, Dwir, B, Pavuna, D, Burri, G
The temperature dependence of the DC resistivity and AC magnetic susceptibility was investigated in bulk ceramics of the BiPbSrCaCuO system with 2212-free (2223) phase. The temperature domain needed...
Interleukin-2 Determinations for Monitoring the Renal Allograft (1990)
Seyfert, U. T., Gumbel, W., Berger, H., Schmidt, U., Albert, F. W.
Our results show that worsening of renal function dependent on cyclosporin, or caused by acute renal insufficiency of postrenal origin, can be distinguished from viral infection and rejection...
Dwir, B, Pavuna, D, Affronte, M, Berger, H, Tholence, J.L
The authors present the percolation and electronic properties of (Y1Ba2Cu3O7-δ)1-xAgx compounds in which silver fills the intergranular space without reducing Tc, which remains at 92±1 K....
Ion beam sputtering and properties of YBaCuO superconducting thin films (1988)
Pavuna, D, Baer, W, Berger, H, Mathieu, H.J, Vogel, A, Schmidt, M, ...
The authors have produced YBaCuO thin films by mono-target ion beam sputtering. Post annealing in O2 at 850°C results in superconducting films on (100) SrTiO3 with R=0 at ~60 K. Preliminary results...
Pavuna, D, Berger, H, Affronte, M, Capponi, J.J, Guillot, M, ...
The authors present electronic properties and critical current densities (jc at 4.2 K, up to 18 T) of (Y1Ba2Cu3O6.9)1-xAgx compounds in which silver fills the intergranular space without reducing Tc...
Electronic properties of superconducting (YBa2 Cu3O6.9)1-xAgx compounds (1988)
Pavuna, D, Berger, H, Affronte, M, Sanjines, R, Dubas, A, ...
We have studied electronic properties of (YBa2Cu3O6.9)1-xAgx compounds with 5, 10, 15, 25 and 50 wt% Ag. In our samples, the silver fills the intergranular space and the superconductivity is...
Lavorel, B., Millot, G., Saint-Loup, R., Gonze, M., Santos, J., Berger, H., ...
The stimulated Raman spectroscopy offers a great advantage over the other coherent Raman techniques : the Raman profile is obtained without distortion as in spontaneous Raman spectroscopy. That's why...
HIGH RESOLUTION STIMULATED RAMAN SPECTROSCOPY WITH A 3 MHz ACCURACY WAVEMETER (1987)
Millot, G., Lavorel, B., Chaux, R., Saint-Loup, R., Terki-Hassaine, M., Santos, J., ...
Stimulated Raman Spectroscopy (SRS) has demonstrated remarkably high sensitiviw for high resolution applications. The best compromise for obtaining a high signal to noise ratio in SRS is to use a...
Lavorel, B., Millot, G., Saint-Loup, R., Gonze, M., Santos, J., Berger, H., ...
The stimulated Raman spectroscopy offers a great advantage over the other coherent Raman techniques : the Raman profile is obtained without distortion as in spontaneous Raman spectroscopy. That's why...
HIGH RESOLUTION STIMULATED RAMAN SPECTROSCOPY WITH A 3 MHz ACCURACY WAVEMETER (1987)
Millot, G., Lavorel, B., Chaux, R., Saint-Loup, R., Terki-Hassaine, M., Santos, J., ...
Stimulated Raman Spectroscopy (SRS) has demonstrated remarkably high sensitiviw for high resolution applications. The best compromise for obtaining a high signal to noise ratio in SRS is to use a...
Lavorel, B., Millot, G., Saint-Loup, R., Wenger, C., Berger, H., Sala, J.P., ...
Self broadened N2 Q-branch spectra are measured by high resolution stimulated Raman spectroscopy in the pressure region 0.25-1.9 atm. and in the temperature range 295-1310 K. Non additivity of the...
Lavorel, B., Millot, G., Saint-Loup, R., Wenger, C., Berger, H., Sala, J.P., ...
Self broadened N2 Q-branch spectra are measured by high resolution stimulated Raman spectroscopy in the pressure region 0.25-1.9 atm. and in the temperature range 295-1310 K. Non additivity of the...
Rétrécissement collisionnel dans N2 mis en évidence par diffusion Raman stimulée (1985)
Millot, G., Lavorel, B., Saint-Loup, R., Berger, H.
Nous mettons en évidence la réduction de la largeur Doppler due au changement de vitesse des molécules lors des collisions pour la molécule N2 autoperturbée à la température ambiante. Cette...
Rétrécissement collisionnel dans N2 mis en évidence par diffusion Raman stimulée (1985)
Millot, G., Lavorel, B., Saint-Loup, R., Berger, H.
Nous mettons en évidence la réduction de la largeur Doppler due au changement de vitesse des molécules lors des collisions pour la molécule N2 autoperturbée à la température ambiante. Cette...
Lavorel, B., Saint-Loup, R., Pierre, G., Berger, H.
Le spectre Raman stimulé du silane a été enregistré entre 2 183 et 2 187 cm-1 sur le spectromètre Raman de Dijon, dont la résolution instrumentale est de 0,0025 cm-1. La résolution du spectre...
Lavorel, B., Saint-Loup, R., Pierre, G., Berger, H.
Le spectre Raman stimulé du silane a été enregistré entre 2 183 et 2 187 cm-1 sur le spectromètre Raman de Dijon, dont la résolution instrumentale est de 0,0025 cm-1. La résolution du spectre...
Nous donnons les expressions des constantes de distorsion centrifuge des molécules XY6 en fonction des fréquences harmoniques ; l'application est faite aux molécules SF 6 et UF6. 4 constantes...
Nous donnons les expressions des constantes de distorsion centrifuge des molécules XY6 en fonction des fréquences harmoniques ; l'application est faite aux molécules SF 6 et UF6. 4 constantes...
Classification of energy levels for polyatomic molecules (1977)
The classification of energy levels for a polyatomic molecule is considered in a new way : the symmetry of rovibrational functions is studied in the invariance group G x O(3) of the full Hamiltonian....
Détermination des constantes scalaires de l'état de base de SF 6 (1977)
Berger, H., Aboumajd, A., Saint-Loup, R.
A partir de l'analyse de la bande Raman ν2 de SF6, les constantes scalaires de l'état de base ont pu être déterminées : B0 = 0,091 11 ± 0,000 05 cm-1, D0 = (0,16 ± 0,08) 10-7 cm-1.
Nouvelle écriture de l'hamiltonien des molécules toupies sphériques XY4 (1976)
En réunissant les oscillateurs ν2(E) et ν4(F 2) pour former à l'approximation zéro un oscillateur à 5 dimensions, on est amené à l'étude des groupes unitaire U(5) et orthogonal...
A. Spectre Raman à haute résolution de la bande ν2 de 12CH4 (1975)
Le spectre Raman de vibration-rotation de la bande ν2 de 12CH4 a été obtenu avec une résolution de 0,13 cm-1 pour les branches O et P et de 0,10 cm-1 pour les branches Q, R et S. La structure...
Abteilung Strahlenschutz und Sicherheit. Jahresbericht 1972. (1973)
Kiefer, H., Koelzer, W., Amann, J., Banschbach, E., Beier, D., Berger, H., ...
KFK-1818 (Mai 73)
Kolloquium Raum- und Abluftueberwachung auf Radioaktivitaet, Kernforschungszentrum Karlsruhe, 15.-16.November 1973
Réalisation d'un laser de laboratoire à argon ionisé (1969)
Nous proposons ici un type de construction de laser ionique de laboratoire, de construction aisée et permettant de travailler dans des gammes de puissances variables.
The end of the stability and growth pact?
J. De Haan, H. Berger, D. Jansen
This paper evaluates the Stability and Growth Pact. After examining the rules in place and the experience so far, the Pact is analysed from a political economy perspective, focusing on the choice for...