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...
Nonlinear magnetic response in ruthenocuprates (2008)
Zivkovic, I., Awana, V. P. S., Berger, H.
We have performed an investigation of the nonlinear magnetic response in ruthenocuprates. A negative, diverging-like peak at the main magnetic transition T_N in RuSr2RECu2O8 (RE = Gd, Y) indicates a...
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, Aebi, Philipp, Forró, L., Berger, H., Garnier, Michael Bernard Gunnar, Clerc, F.
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, Aebi, Philipp, Forró, L., Berger, H., Garnier, Michael Bernard Gunnar, Clerc, F.
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...
Pseudogap-driven Hall effect sign reversal (2008)
Evtushinsky, D. V., Borisenko, S. V., Kordyuk, A. A., Zabolotnyy, V. B., Inosov, D. S., Buechner, B., ...
We present a calculation of the Hall coefficient in 2H-TaSe2 and 2H-Cu0.2NbS2 relied on the photoemission data and compare the results to transport observations. The approach, based on the solution...
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...
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...
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...
The evolution of the Non-Fermi Liquid behavior of BaVS$_3$ under high pressure (2007)
Barišić, N., Akrap, A., Berger, H., Forró, L.
Temperature, pressure, and magnetic field dependencies of the resistivity of BaVS$_3$ were measured above the critical pressure of $p_{cr}$=2 GPa, which is associated with the zero temperature...
Hysteretic behavior at the collapse of the metal-insulator transition in BaVS$_3$ (2007)
Barišić, N., Akrap, A., Berger, H., Forró, L.
Electrical resistivity as a function of temperature, pressure, and magnetic field was measured in high and low purity single crystals of BaVS$_3$ close to the critical pressure value...
Huang, C. L., Chang, Y. T., Sun, C. P., Shen, H. Y., Chou, C. C., ...
To resolve the discrepancies of the superconducting order parameter in quasi-two-dimensional NbSe_2, comprehensive specific-heat measurements have been carried out. By analyzing both the zero-field...
Momentum and excitation energy dependence of the "waterfalls" in cuprates (2007)
Inosov, D. S., Fink, J., Kordyuk, A. A., Borisenko, S. V., Zabolotnyy, V. B., Schuster, R., ...
Using high-resolution angle-resolved photoemission spectroscopy we have studied the momentum and photon energy dependence of the anomalous high-energy dispersion, termed "waterfalls", between the...
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 newly-developed method offers a powerful tool...
Spin resonance in the ordered magnetic state of Ni-5(TeO3)(4)Cl-2 (2007)
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...
Separation of Orbital Contributions to the Optical Conductivity of BaVS3 (2007)
Kézsmárki, I., Mihály, G., Gaál, R., Barišić, N., Akrap, A., Berger, H., ...
Muon Spin Spectroscopy evidence of the violation of Anderson condition in magnetite (2007)
Bimbi, M., Allodi, G., De Renzi, R., Mazzoli, C., Berger, H.
We present new muon spectroscopy data on a Fe$_3$O$_4$ single crystal, revealing different spin precession patterns in five distinct temperature ranges. A careful analysis of the local field and its...
Collective Charge Excitations below the Metal-to-Insulator Transition in BaVS3 (2007)
Ivek, T., Vuletic, T., Tomic, S., Akrap, A., Berger, H., Forro, L.
The charge response in the barium vanadium sulfide (BaVS3) single crystals is characterized by dc resistivity and low frequency dielectric spectroscopy. A broad relaxation mode in MHz range with huge...
Pseudogap and charge density waves in two dimensions (2007)
Borisenko, S. V., Kordyuk, A. A., Yaresko, A. N., Zabolotnyy, V. B., Inosov, D. S., Schuster, R., ...
An interaction between electrons and lattice vibrations (phonons) results in two fundamental quantum phenomena in solids: in three dimensions it can turn a metal into a superconductor whereas in one...
Geck, J., Borisenko, S. V., Berger, H., Eschrig, H., Fink, J., Knupfer, M., ...
We report an angular resolved photoemission study of Na0.73CoO2 where it is found that the renormalization of the quasiparticle (QP) dispersion changes dramatically upon a rotation from GM to GK. The...
Microstructure and electrical properties of pure 110 K phase in the BiPbSrCaCuO system (2007)
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...
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 (2007)
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 (2007)
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...
On linear resistivity from ~1 to 103 K in Sr2RuO4-δ single crystals grown by flux technique (2007)
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...
"Waterfalls" phenomenon in superconducting cuprates (2007)
Inosov, D. S., Kordyuk, A. A., Borisenko, S. V., Zabolotnyy, V. B., Fink, J., Knupfer, M., ...
We show that the "waterfalls", as reported in recent ARPES studies on HTSC, can neither be described as a part of a self-consistent quasiparticle spectrum nor represent a new physical phenomena,...
Crossovers in the out-of-plane resistivity of superconducting Tl2Ba2CaCu2O8 single crystals (2007)
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...
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...
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...
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...
The electronic structure and the phases of BaVS3 (2007)
Fazekas, P., Penc, K., Radnoczi, K., Barisic, N., Berger, H., Forro, L., ...
BaVS3 is a moderately correlated d-electron system with a rich phase diagram. To construct the corresponding minimal electronic model, one has to decide which d-states are occupied, and to which...
"Waterfalls" in cuprates (2007)
Kordyuk, A. A., Borisenko, S. V., Inosov, D., Zabolotnyy, V. B., Fink, J., Buechner, B., ...
New hot topic in ARPES on HTSC, the observation of the so called "waterfalls", is addressed. The energy scale at about 0.2-0.3 eV that can be derived from the coherent component of ARPES spectra...
Complete Fermi surface mapping of Bi-cuprates (2007)
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 (2007)
Aebi, P, Schlapbach, L, Schwaller, P, Osterwalder, J, Berger, H, Beeli, C
On the electronic properties of the quasi-one-dimensional crystal Nb/sub 4/Te/sub 17/I/sub 4/ (2007)
Berger, H, Marsi, M, Margaritondo, G, Forro, L, Beeli, C, Crotti, C, ...
Spectral consequences of broken phase coherence in 1T-TaS/sub 2/ (2007)
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...
Incommensurate magnetism in the coupled spin tetrahedra system Cu2Te2O5Cl2 (2007)
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...
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...