Dynamical response and confinement of the electrons at the LaAlO3/SrTiO3 interface (2009)
Dubroka, A., Roessle, M., Kim, K. W., Malik, V. K., Schulz, L., Thiel, S., ...
With infrared ellipsometry and transport measurements we investigated the electrons at the interface between LaAlO3 and SrTiO3. We obtained a sheet carrier density of Ns~5-9x 10E13 cm^-2, an...
Chaloupka, J., Bernhard, C., Munzar, D.
We report on results of our theoretical study of the c-axis infrared conductivity of bilayer high-Tc cuprate superconductors using a microscopic model involving the bilayer-split (bonding and...
Bernhard, C., Drew, A. J., Schulz, L., Malik, V. K., Roessle, M., Niedermayer, Ch., ...
We present a muon spin rotation (\muSR) study of the magnetic and superconducting properties of single crystals of electron-doped BaFe2-xCoxAs2 with x=0.08, 0.20, and 0.25 (Tc=9, 25 and 20K) and of...
Bernhard, C., Yu, L., Dubroka, A., Kim, K.W., Rössle, M., Munzar, D., ...
Journal of Physics and Chemistry of Solids, 69(2008) S.3064-69
Bernhard, C., Drew, A.J., Schulz, L., Malik, V.K., Rössle, M., Niedermayer, C., ...
New Journal of Physics, 11(2009) S.055050/1-15
Drew, A. J., Niedermayer, Ch., Baker, P. J., Pratt, F. L., Blundell, S. J., Lancaster, T., ...
The recent observation of superconductivity with critical temperatures up to 55 K in the FeAs based pnictide compounds marks the first discovery of a non copper-oxide based layered high-Tc...
Moon, S. J., Jin, H., Kim, K. W., Choi, W. S., Lee, Y. S., Yu, J., ...
We investigated the electronic structures of the 5$d$ Ruddlesden-Popper series Sr$_{n+1}$Ir$_{n}$O$_{3n+1}$ ($n$=1, 2, and $\infty$) using optical spectroscopy and first-principles calculations. As...
Electronic liquid crystal state in the high-temperature superconductor YBCO(6.45) (2008)
Hinkov, V., Haug, D., Fauque, B., Bourges, P., Sidis, Y., Ivanov, A., ...
Electronic phases with symmetry properties matching those of conventional liquid crystals have recently been discovered in transport experiments on semiconductor heterostructures and metal oxides at...
Hoppler, J., Stahn, J., Bouyanfif, H., Malik, V. K., Patterson, B. D., Willmott, P. R., ...
We investigated with synchrotron x-ray diffraction and reflectometry the formation of structural domains in the near-surface region of single crystalline SrTiO3 (001) substrates with...
Dubroka, A., Kim, K. W., Roessle, M., Malik, V. K., Liu, R. H., Wu, G., ...
We present ellipsometric measurements of the far-infrared dielectric response of polycrystalline samples of the new pnictide superconductor RO0.82F0.18FeAs (R=Nd and Sm). We find evidence that the...
Drew, A. J., Pratt, F. L., Lancaster, T., Blundell, S. J., Baker, P. J., Liu, R. H., ...
Muon-spin rotation experiments were performed on the pnictide high temperature superconductor SmFeAsO$_{1-x}$F$_{x}$ with x=0.18 and 0.3. We observed an unusual enhancement of slow spin fluctuations...
Charge dynamics of doped holes in high Tc cuprates - A clue from optical conductivity (2008)
Mishchenko, A. S., Nagaosa, N., De Filippis, G., Cataudella, V., Devereaux, T. P., ...
The charge dynamics in weakly hole doped high temperature superconductors is studied in terms of the accurate numerical solution to a model of a single hole interacting with a quantum lattice in an...
Drew, A. J., Hoppler, J, Schulz, L, Pratt, F. L., Desai, P, Shakya, P, ...
Electronic devices that use the spin degree of freedom hold unique prospects for future technology. The performance of these 'spintronic' devices relies heavily on the efficient transfer of spin...
Yu, L., Munzar, D., Boris, A.V., Yordanov, P., Chaloupka, J., Wolf, Th., ...
Physical Review Letters, 100(2008) S.177004/1-4
Drew, AJ, Pratt, FL, Lancaster, T, Blundell, SJ, Baker, PJ, Liu, RH, ...
Optical response of ferromagnetic YTiO_3 studied by spectral ellipsometry (2007)
Kovaleva, N. N., Boris, A. V., Yordanov, P., Maljuk, A., Brüchner, E., Strempfer, J., ...
We have studied the temperature dependence of spectroscopic ellipsometry spectra of an electrically insulating, nearly stoichiometric YTiO_3 single crystal with ferromagnetic Curie temperature T_C =...
Superconductivity in epitaxial thin films of NaxCoO2 y D2O (2007)
Krockenberger, Y., Fritsch, I., Christiani, G., Yu, Li, Bernhard, C., ...
The observation of superconductivity in the layered transition metal oxide NaxCoO2 y H2O (K. Takada et al., Nature 422, 53 (2003)) has caused a tremendous upsurge of scientific interest due to its...
Yu, Li, Munzar, D., Boris, A. V., Yordanov, P., Chaloupka, J., Wolf, Th., ...
We report on broad-band infrared ellipsometry measurements of the c-axis conductivity of underdoped RBa_{2}Cu_{3}O_{7-d} (R=Y, Nd, and La) single crystals. Our data provide a detailed account of the...
Optical Study of the Free Carrier Response of LaTiO3/SrTiO3 Superlattices (2007)
Seo, S. S. A., Choi, W. S., Lee, H. N., Yu, L., Kim, K. W., Bernhard, C., ...
We used infrared spectroscopic ellipsometry to investigate the electronic properties of LaTiO3/SrTiO3 superlattices (SLs). Our results indicated that, independent of the SL periodicity and individual...
Absence of an isotope effect in the magnetic resonance in high-$T_c$ superconductors (2007)
Pailhès, S., Bourges, P., Sidis, Y., Bernhard, C., Keimer, B., Lin, C. T., ...
An inelastic neutron scattering experiment has been performed in the high-temperature superconductor $\rm YBa_2Cu_3O_{6.89}$ to search for an oxygen-isotope shift of the well-known magnetic resonance...
Two resonant magnetic modes in an overdoped high-$\bf T_c$ superconductor (2007)
Pailhes, S., Sidis, Y., Bourges, P., Ulrich, C., Hinkov, V., Regnault, L. P., ...
A detailed inelastic neutron scattering study of the overdoped high temperature copper oxide superconductor ${Y_{0.9}Ca_{0.1}Ba_{2}Cu_3O_{7}}$ reveals two distinct magnetic resonant modes in the...
Doping induced magnetic clusters and Co spin state transition in Na_xCoO_2 with 0.78 (2007)
Bernhard, C., Niedermayer, Ch., Drew, A., Khaliullin, G., Bayrakci, S., Strempfer, J., ...
By muon spin rotation we investigated the magnetic properties of a series of highly Na doped NaxCoO2 single crystals with 0.78(1)
Bernhard, C., Yu, L., Dubroka, A., Kim, K.W., Rössle, M., Munzar, D., ...
Yamada Conf.LXI : Spectroscopies in Novel Superconductors (SNS 2007), Sendai, J, August 20-24, 2007
Antiferromagnetic ordering in superconducting ${\bf YBa_2Cu_3O_{6.5}}$ (2006)
Sidis, Y., Ulrich, C., Bourges, P., Bernhard, C., Niedermayer, C., Regnault, L. P., ...
Commensurate antiferromagnetic ordering has been observed in the superconducting high-$Tc$ cuprate ${\rm YBa_{2}Cu_{3}O_{6.5}}$ (${\rm T_{c}}$=55 K) by polarized and unpolarized elastic neutron...
The ruthenocuprates: natural superconductor-ferromagnet multilayers (2006)
Nachtrab, T., Bernhard, C., Lin, C. T., Koelle, D., Kleiner, R.
The recently discovered ruthenocuprates have attracted great interest because of the microscopic coexistence of superconducting and ferromagnetic order. Typically, these materials become magnetically...
Electronic phase separation in La2-xSrxCuO4+y (2006)
Mohottala, H. E., Wells, B. O., Budnick, J. I., Hines, W. A., Niedermayer, C., Bernhard, C., ...
We have discovered an electronically driven phase separation in super-oxygenated La2-xSrxCuO4+y, with various Sr contents. The samples have been characterized by muon spin rotation and bulk...
Adler, P., Lebon, A., Damljanović, V., Ulrich, C., Bernhard, C., Boris, A. V., ...
Single crystals of iron(IV) rich oxides SrFeO3-delta with controlled oxygen content (0
Superconductivity in epitaxial thin films of NaxCoO2·yD2O (2006)
Krockenberger, Y., Fritsch, I., Christiani, G., Yu, L., Bernhard, C., ...
The observation of superconductivity in the layered transition metal oxide NaxCoO2 center dot yH(2)O [K. Takada , Nature (London) 422, 53 (2003)] has caused a tremendous upsurge of scientific...
Magnetism at the interface between ferromagnetic and superconducting oxides (2006)
Chakhalian, J., Freeland, J. W., Srajer, G., Strempfer, J., Khaliullin, G., Cezar, J. C., ...
Phase separation in superoxygenated La2-xSrxCuO4+y (2006)
Mohottala, H. E., Wells, B. O., Budnick, J. I., Hines, W. A., Niedermayer, C., Udby, L., ...
The complex interplay between superconducting and magnetic phases remains poorly understood. Here, we report on the phase separation of doped holes into separate magnetic and superconducting regions...
Raman scattering study of Ru(Sr,La)2GdCu2O8 (2006)
Damljanovic, V., Ulrich, C., Bernhard, C., Keimer, B., Mandal, P., Krimmel, A., ...
Trajnerowicz, A., Golnik, A., Bernhard, C., Machtoub, L., Ulrich, C., Tallon, J. L., ...
The phonon spectra of YBa2Cu4O8 polycrystalline samples with different isotope substitution for Ba, Cu, and O have been studied using far-infrared ellipsometry and Raman scattering. The observed...
Magnetism at the interface between ferromagnetic and superconducting oxides (2006)
Chakhalian, J, Freeland, JW, Srajer, G, Strempfer, J, Khaliullin, G, Cezar, JC, ...
Brunschwig, G., Josien, E., Bernhard, C.
Among all the constraints conditioning the utilization of the fields in livestock farming, those that pertain to geography are little studied, in spite of their increasing importance under the...
Infrarot-Ellipsometrie bei ANKA. (2006)
Bernhard, C., Boris, A., Keimer, B., Mathis, Y.L.
Nachrichten - Forschungszentrum Karlsruhe, 37(2005) S.169-74
The anomalous c-axis conductivity of the cuprate HTSC probed by infrared ellipsometry. (2006)
Bernhard, C., Yu, L., Wolf, T., Lin, C.T., Boris, A., Keimer, B.
8th Internat.Conf.on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (M2S-HTSC-VIII), Dresden, July 9-14, 2006
Adler, P., Lebon, A., Damljanovic, V., Ulrich, C., Bernhard, C., Boris, A. V., ...
Single crystals of iron(IV) rich oxides SrFeO(3-x) with controlled oxygen content have been studied by Moessbauer spectroscopy, magnetometry, magnetotransport measurements, Raman spectroscopy, and...
Orbital ordering transition in Ca$_2$RuO$_4$ observed with resonant x-ray diffraction (2005)
Zegkinoglou, I., Strempfer, J., Nelson, C. S., Hill, J. P., Chakhalian, J., Bernhard, C., ...
Resonant x-ray diffraction performed at the $\rm L_{II}$ and $\rm L_{III}$ absorption edges of Ru has been used to investigate the magnetic and orbital ordering in Ca$_2$RuO$_4$ single crystals. A...
The Ruthenocuprates - Natural Superconductor-Ferromagnet Multilayers (2005)
Nachtrab, T., Bernhard, C., Lin, C. T., Koelle, D., Kleiner, R.
The recently discovered ruthenocuprates have attracted great interest because of the microscopic coexistence of superconducting and ferromagnetic order. Typically, these materials become magnetically...
Absence of an isotope effect in the magnetic resonance in high-$T_c$ superconductors (2005)
Pailhès, S., Bourges, P., Sidis, Y., Bernhard, C., Keimer, B., Lin, C. T., ...
An inelastic neutron scattering experiment has been performed in the high-temperature superconductor $\rm YBa_2Cu_3O_{6.89}$ to search for an oxygen-isotope shift of the well-known magnetic resonance...
Magnetic proximity effect in perovskite superconductor/ferromagnet multilayers (2005)
Stahn, J., Chakhalian, J., Niedermayer, C., Hoppler, J., Gutberlet, T., Voigt, J., ...
Nickel Impurity-Induced Enhancement of the Pseudogap of Cuprate High-Tc Superconductors (2005)
Pimenov, A. V., Boris, A. V., Yu, L., Hinkov, V., Wolf, T., Tallon, J. L., ...
Absence of an isotope effect in the magnetic resonance in high-Tc superconductors (2005)
Pailhès, S., Bourges, P., Sidis, Y., Bernhard, C., Keimer, B., Lin, C. T., ...
Orbital Ordering Transition in Ca2RuO4 Observed with Resonant X-Ray Diffraction (2005)
Zegkinoglou, I., Strempfer, J., Nelson, C. S., Hill, J. P., Chakhalian, J., Bernhard, C., ...
Low-energy excitations in La1.2Sr1.8Mn2O7 investigated by ellipsometry (2005)
Mercier, O. R., Buckley, R. G., Trodahl, H. J., Bernhard, C., Balakrishnan, G.
Brunschwig, G., Josien, E., Bernhard, C.
/ Parmi les contraintes conditionnant le mode d'utilisation des parcelles dans les systèmes d'élevage, les contraintes géographiques sont peu étudiées, malgré leur importance croissante dans le...
Nickel impurity-induced enhancement of the pseudogap of cuprate high-T§c superconductors. (2005)
Pimenov, A.V., Boris, A.V., Yu, L., Hinkov, V., Wolf, T., Tallon, J.L., ...
Physical Review Letters, 94(2005) S.227003/1-4
Pimenov, A.V., Boris, A.V., Yu, L., Hinkov, V., Wolf, T., Keimer, B., ...
ANKA - Annual Report 2005 S.14-15
Ni impurity induced enhancement of the pseudogap in cuprate high T_c superconductors (2004)
Pimenov, A. V., Boris, A. V., Yu, Li, Hinkov, V., Wolf, Th., Tallon, J. L., ...
The influence of magnetic Ni and non-magnetic Zn impurities on the normal state pseudogap (PG) in the c-axis optical conductivity of NdBa$_{2}$\{Cu$% _{1-y}$(Ni,Zn)$_{y}\}_{3}$O$_{7-\delta}$ crystals...
Hinkov, V., Pailhes, S., Bourges, P., Sidis, Y., Ivanov, A., Kulakov, A., ...
The fundamental building block of the copper oxide superconductors is a Cu4O4 square plaquette. In most of these materials, the plaquettes are slightly distorted and form a rectangular lattice. An...
Magnetic Proximity Effect in Perovskite Superconductor/Ferromagnet Multilayers (2004)
Stahn, J., Chakhalian, J., Niedermayer, C., Hoppler, J., Gutberlet, T., Voigt, J., ...
$\mathrm{YBa_2Cu_3O_7/La_{2/3}Ca_{1/3}MnO_3}$ superconducting/ferromagnetic (SC/FM) multilayers have been studied by neutron reflectometry. Evidence for a characteristic difference between the...
Spin-controlled Mott-Hubbard bands in LaMnO_3 probed by optical ellipsometry (2004)
Kovaleva, N. N., Boris, A. V., Bernhard, C., Kulakov, A., Pimenov, A., Balbashov, A. M., ...
Spectral ellipsometry has been used to determine the dielectric function of an untwinned crystal of LaMnO_3 in the spectral range 0.5-5.6 eV at temperatures 50 K < T < 300 K. A pronounced...
In-Plane Spectral Weight Shift of Charge Carriers in $YBa_2Cu_3O_{6.9}$ (2004)
Boris, A. V., Kovaleva, N. N., Dolgov, O. V., Holden, T., Lin, C. T., Keimer, B., ...
The temperature dependent redistribution of the spectral weight of the $CuO_2$ plane derived conduction band of the $YBa_2Cu_3O_{6.9}$ high temperature superconductor (T_c = 92.7 K) was studied with...
Charge ordering and magneto-polarons in Na$_{0.82}$CoO$_2$ (2004)
Bernhard, C., Boris, A. V., Kovaleva, N. N., Khaliullin, G., Pimenov, A., Yu, L., ...
Using spectral ellipsometry, we have measured the dielectric function of a Na$_{0.82(2)}$CoO$_2$ crystal that exhibits bulk antiferromagnetism with T$_{N}$=19.8 K. We identify two prominent...
Intrinsic Josephson Effects in the Magnetic Superconductor RuSr2GdCu2O8 (2004)
Nachtrab, T., Koelle, D., Kleiner, R., Bernhard, C., Lin, C. T.
We have measured interlayer current transport in small sized RuSr2GdCu2O8 single crystals. We find a clear intrinsic Josephson effect showing that the material acts as a natural...
Oxygen superstructures throughout the phase diagram of (Y,Ca)Ba2Cu3O6+x. (2004)
Strempfer, J., Zegkinoglou, I., Rütt, U., Zimmermann, M.von, Bernhard, C., Lin, C., ...
Magnetism, Charge Order, and Giant Magnetoresistance in SrFeO3-δ Single Crystals (2004)
Lebon, A., Adler, P., Bernhard, C., Boris, A. V., Pimenov, A. V., Maljuk, A., ...
The electronic and magnetic properties of SrFeO3-delta single crystals with controlled oxygen content (0less than or equal todeltaless than or equal to0.19) have been studied systematically by...
c-axis lattice dynamics in Bi-based cuprate superconductors (2004)
Kovaleva, N. N., Boris, A. V., Holden, T., Ulrich, C., Liang, B., Lin, C. T., ...
We present the results of a systematic study of the c-axis lattice dynamics in single-layer Bi2Sr2CuO6 (Bi2201), bilayer Bi2Sr2CaCu2O8 (Bi2212), and trilayer Bi2Sr2Ca2Cu3O10 (Bi2223) cuprate...
Bernhard, C., Holden, T., Boris, A. V., Kovaleva, N. N., Pimenov, A. V., Humlíček, J., ...
We observe a large and anomalous oxygen isotope effect on the a-axis component of the far-infrared electronic response of detwinned (YBa2Cu3O6.9)-O-16,18. For O-18 a pronounced low-energy electronic...
Proximity induced metal-insulator transition in YBa2Cu3O7/La2/3Ca1/3MnO3 superlattices (2004)
Holden, T., Cristiani, G., Golnik, A., Boris, A., Pimenov, A., ...
The far-infrared dielectric response of superlattices (SL) composed of superconducting YBa2Cu3O7 (YBCO) and ferromagnetic La0.67Ca0.33MnO3 (LCMO) has been investigated by ellipsometry. A drastic...
Intrinsic Josephson Effects in the Magnetic Superconductor RuSr2GdCu2O8 (2004)
Nachtrab, T., Koelle, D., Kleiner, R., Bernhard, C., Lin, C. T.
We have measured interlayer current transport in small-sized RuSr2GdCu2O8 single crystals. We find a clear intrinsic Josephson effect showing that the material acts as a natural...
Liang, B., Bernhard, C., Wolf, T., Lin, C. T.
Sizable Bi2Sr2Ca2Cu3O10+delta (Bi-2223) single crystals were grown by the travelling solvent floating zone technique and subsequently annealed in 02 and/or Ar flow for 120-500 h in a temperature...
Bulk antiferromagnetism in Na0.82CoO2 single crystals (2004)
Bayrakci, S. P., Bernhard, C., Chen, D. P., Keimer, B., Kremer, R. K., Lemmens, P., ...
Susceptibility, specific heat, and muon spin rotation measurements on high-quality single crystals of Na0.82CoO2 have revealed bulk antiferromagnetism with Neel temperature T-N=19.8+/-0.1 K and an...
In-Plane Spectral Weight Shift of Charge Carriers in YBa2Cu3O6.9 (2004)
Boris, A. V., Kovaleva, N. N., Dolgov, O. V., Holden, T., Lin, C. T., Keimer, B., ...
The temperature-dependent redistribution of the spectral weight of the CuO2 plane-derived conduction band of the YBa2 Cu-3 O-6.9 high-temperature superconductor (superconducting transition...
Diffraction effects in infrared ellipsometry of conducting samples (2004)
We investigate theoretically polarization effects occurring in infrared spectra of finite-size conducting samples. In ellipsometric data taken at grazing incidence, a strong influence of sample edges...
Bernhard, C., Humlíček, J., Keimer, B.
We describe the setup of an ellipsometer for the far- to mid-infrared (FIR-MIR) spectral range that is used in combination with a Fourier-transform infrared (FTIR) spectrometer and a synchrotron...
Oxygen Superstructures Throughout the Phase Diagram of (Y,Ca)Ba2Cu3O6+x (2004)
Strempfer, J., Zegkinoglou, I., Rütt, U., Von Zimmermann, M., Bernhard, C., Lin, C. T., ...
Charge Ordering and Magnetopolarons in Na0.82CoO2 (2004)
Bernhard, C., Boris, A. V., Kovaleva, N. N., Khaliullin, G., Pimenov, A., Yu, L., ...
Spin-Controlled Mott-Hubbard Bands in LaMnO3 Probed by Optical Ellipsometry (2004)
Kovaleva, N. N., Boris, A. V., Bernhard, C., Kulakov, A., Pimenov, A., Balbashov, A. M., ...
Oxygen superstructures throughout the phase diagram of (Y,Ca)Ba§2Cu§3O§6§+§x. (2004)
Strempfer, J., Zegkinoglou, I., Rütt, U., Zimmermann, M.von, Bernhard, C., Lin, C., ...
Frühjahrstagung des Arbeitskreises Festkörperphysik (AKF) der DPG, Fachverband Tiefe Temperaturen, Regensburg, 8.-12.März 2004 (Poster)
Liang, B., Bernhard, C., Wolf, T., Lin, C.T.
Superconductor Science and Technology, 17(2004) S.731-38
Bernhard, C., Boris, A.V., Kovaleva, N.N., Pimenov, A.V., Yu, L., Lin, C.T., ...
Internat.Conf.on Strongly Correlated Electron Systems (SCES '04), Karlsruhe, July 26-30, 2004
Bulk antiferromagnetism in $\bf Na_{0.82}CoO_2$ single crystals (2003)
Bayrakci, S., Bernhard, C., Chen, D. P., Keimer, B., Kremer, R. K., Lemmens, P., ...
Susceptibility, specific heat, and muon spin rotation measurements on high-quality single crystals of $\rm Na_{0.82}CoO_2$ have revealed bulk antiferromagnetism with N\'{e}el temperature $\rm T_N =...
Martinho, H., Martin, A. A., Rettori, C., Lin, C. T., Bernhard, C.
The electronic Raman scattering has been investigated in optimally oxygen doped YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ single crystals as well as in crystals with non-magnetic, Zn, and magnetic, Ni,...
Oxygen superstructures throughout the phase diagram of $\bf (Y,Ca)Ba_2 Cu_3 O_{6+x}$ (2003)
Strempfer, J., Zegkinoglou, I., Ruett, U., Zimmermann, M. V., Bernhard, C., Lin, C. T., ...
Short-range lattice superstructures have been studied with high-energy x-ray diffuse scattering in underdoped, optimally doped, and overdoped $\rm (Y,Ca)Ba_2 Cu_3 O_{6+x}$. A new four-unit-cell...
Magnetism, Charge Order and Giant Magnetoresistance in SrFeO$_{3-\delta}$ Single Crystals (2003)
Lebon, A., Adler, P., Bernhard, C., Boris, A. V., Pimenov, A. V., Maljuk, A., ...
The electronic and magnetic properties of SrFeO$_{3-\delta}$ single crystals with controlled oxygen content ($0 \leq \delta \leq 0.19$) have been studied systematically by susceptibility, transport...
Two resonant magnetic modes in an overdoped high-$\bf T_c$ superconductor (2003)
Pailhes, S., Sidis, Y., Bourges, P., Ulrich, C., Hinkov, V., Regnault, L. P., ...
A detailed inelastic neutron scattering study of the overdoped high temperature copper oxide superconductor ${Y_{0.9}Ca_{0.1}Ba_{2}Cu_3O_{7}}$ reveals two distinct magnetic resonant modes in the...
C-axis lattice dynamics in Bi-based cuprate superconductors (2003)
Kovaleva, N. N., Boris, A. V., Munzar, D., Holden, T., Ulrich, C., Tallon, J. L., ...
We present results of a systematic study of the c axis lattice dynamics in single layer Bi2Sr2CuO6 (Bi2201), bilayer Bi2Sr2CaCu2O8 (Bi2212) and trilayer Bi2Sr2Ca2Cu3O10 (Bi2223) cuprate...
Bernhard, C., Holden, T., Boris, A. V., Kovaleva, N. N., Pimenov, A. V., Humlicek, J., ...
We observe an anomalous oxygen isotope effect on the a-axis component of the far-infrared electronic response of detwinned YBa2Cu3$^{16,18}$O$_{6.9}$. For $^{18}$O a pronounced low-energy electronic...
Holden, Todd, Habermeier, H-U., Cristiani, G., Golnik, A., Boris, A., Pimenov, A., ...
The far-infrared dielectric response of superlattices (SL) composed of superconducting YBa$_{2}$Cu$_{3}$O$_{7}$ (YBCO) and ferromagnetic La$_{0.67}$% Ca$_{0.33}$MnO$_{3}$ (LCMO) has been investigated...
Magneto-Transport Properties of Doped RuSr$_2$GdCu$_2$O$_8$ (2003)
McCrone, J. E., Tallon, J. L., Cooper, J. R., MacLaughlin, A. C., Attfield, J. P., Bernhard, C.
RuSr$_2$GdCu$_2$O$_8$, in which magnetic order and superconductivity coexist with $T_{Magnetic}$$\gg$$T_c$, is a complex material which poses new and important questions to our understanding of the...
The superfluid density in cuprate high-Tc superconductors a new paradigm (2003)
Tallon, J L, Loram, J W, Cooper, J R, Panagopoulos, C, Bernhard, C
Magnetotransport properties of doped RuSr2GdCu2O8 (2003)
McCrone, J E, Tallon, J L, Cooper, J R, MacLaughlin, A C, Attfield, J. Paul, Bernhard, C
RuSr2GdCu2O8, in which magnetic order and superconductivity coexist with Tmag>Tc , is a complex material which poses new and important questions to our understanding of the interplay between magnetic...
Munzar, D., Holden, T., Bernhard, C.
We present an extension of the c-axis tight-binding sum rule discussed by Chakravarty, Kee, and Abrahams [Phys. Rev. Lett. 82, 2366 (1999)] that applies to multilayer high-T-c cuprate superconductors...
Magnetotransport properties of doped RuSr2GdCu2O8 (2003)
McCrone, J. E., Tallon, J. L., Cooper, J. R., MacLaughlin, A. C., Attfield, J. P., Bernhard, C.
Superfluid density in cuprate high-Tc superconductors: A new paradigm (2003)
Tallon, J. L., Loram, J. W., Cooper, J. R., Panagopoulos, C., Bernhard, C.
Two Resonant Magnetic Modes in an Overdoped High Tc Superconductor (2003)
Pailhès, S., Sidis, Y., Bourges, P., Ulrich, C., Hinkov, V., Regnault, L. P., ...
Magnetotransport properties of doped RuSr2GdCu2O8 (2003)
McCrone, J E, Tallon, J L, Cooper, J R, MacLaughlin, A C, Attfield, J. Paul, Bernhard, C
RuSr2GdCu2O8, in which magnetic order and superconductivity coexist with Tmag>Tc , is a complex material which poses new and important questions to our understanding of the interplay between magnetic...
Josephson plasma resonance and phonon anomalies in trilayer Bi§2Sr§2Ca§2Cu§3O§1§0. (2003)
Boris, A.V., Munzar, D., Kovaleva, N.N., Liang, B., Lin, C.T., Dubroka, A., ...
Physical Review Letters, 89(2002) S.277001/1-4
The superfluid density in cuprate high-Tc superconductors - a new paradigm (2002)
Tallon, J. L., Loram, J. W., Cooper, J. R., Panagopoulos, C., Bernhard, C.
The doping dependence of the superfluid density, r_s, of high-Tc superconductors is usually considered in the context of the Uemura relation, namely Tc proportional to rs, which is generally assumed...
Boris, A. V, Munzar, D., Kovaleva, N. N., Liang, B., Lin, C. T., Dubroka, A., ...
The far-infrared (FIR) c axis conductivity of a Bi2223 crystal has been measured by ellipsometry. Below T$_c$ a strong absorption band develops near 500 cm $^{-1}$, corresponding to a transverse...
Structural and Magnetic Instabilities of La$_{2-x}$Sr$_x$CaCu$_2$O$_6$ (2002)
Ulrich, C., Kondo, S., Reehuis, M., He, H., Bernhard, C., Niedermayer, C., ...
A neutron scattering study of nonsuperconducting La$_{2-x}$Sr$_x$CaCu$_2$O$_6$ (x=0 and 0.2), a bilayer copper oxide without CuO chains, has revealed an unexpected tetragonal-to-orthorhombic...
Josephson Plasma Resonance and Phonon Anomalies in Trilayer Bi2Sr2Ca2Cu3O10 (2002)
Boris, A. V., Munzar, D., Kovaleva, N. N., Liang, B., Lin, C. T., Dubroka, A., ...
The far-infrared (FIR) c axis conductivity of a Bi2223 crystal has been measured by ellipsometry. Below T-c a strong absorption band develops near 500 cm(-1), corresponding to a transverse Josephson...
Structural and magnetic instabilities of La2-xSrxCaCu2O6 (2002)
Ulrich, C., Kondo, S., Reehuis, M., He, H., Bernhard, C., Niedermayer, C., ...
A neutron-scattering study of nonsuperconducting La2- xSrxCaCu2O6 (x=0 and 0.2), a bilayer copper oxide without CuO chains, has revealed an unexpected tetragonal-to-orthorhombic transition with a...
Boris, A. V., Bernhard, C., Kovaleva, N. N., Mandal, P., Loidl, A.
We have performed ellipsometric measurements of the infrared dielectric response of RuSr2GdCu2O8 polycrystalline ceramics. The transformation of the Cu-O bending phonon mode at 288 cm(- 1) in the...
Muon spin relaxation study of the magnetic penetration depth in MgB2 (2002)
Niedermayer, C., Bernhard, C., Holden, T., Kremer, R. K., Ahn, K.
The magnetic vortex lattice (VL) of polycrystalline MgB2 has been investigated by transverse-field muon spin relaxation (TF- muSR). The evolution of the TF-muSR depolarization rate sigma, which is...
Bernhard, C., Holden, T., Humlíček, J., Munzar, D., Golnik, A., Kläser, M., ...
The in-plane dielectric response of detwinned YBa2Cu3O6.95 has been studied by far-infared ellipsometry. A surprisingly large number of in-plane polarized modes are observed. Some of them correspond...
Structural and magnetic instabilities of La2-xSrxCaCu2O6 (2002)
Ulrich, C., Kondo, S., Reehuis, M., He, H., Bernhard, C., Niedermayer, C., ...
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Structural and magnetic instabilities of La2-xSrxCaCu2O6 (2002)
Ulrich, C., Kondo, S., Reehuis, M., He, H., Bernhard, C., Niedermayer, C., ...
A neutron-scattering study of nonsuperconducting La2-xSrxCaCu2O6 (x=0 and 0.2), a bilayer copper oxide without CuO chains, has revealed an unexpected tetragonal-to-orthorhombic transition with a...
Bernhard, C., Holden, T., Humlicek, J., Munzar, D., Golnik, A., Kläser, M., ...
Solid State Communications, 121(2002) S.93-97
Muon-spin-relaxation study of the magnetic penetration depth in MgB2 (2001)
Niedermayer, Ch., Bernhard, C., Holden, T., Kremer, R. K., Ahn, K.
The magnetic vortex lattice (VL) of polycrystalline MgB2 has been investigated by transverse-field muon-spin-relaxation (TF-MuSR). The evolution of TF-MuSR depolarization rate, sigma, that is...
Bernhard, C., Holden, T., Humlíček, J., Munzar, D., Golnik, A., Kläser, M., ...
The in-plane dielectric response of detwinned YBa$_{2}$Cu$_{3}$O$_{6.95}$ has been studied by far-infared ellipsometry. A surprisingly lare number of in-plane polarized modes are observed. Some of...
Antiferromagnetic ordering in superconducting ${\bf YBa_2Cu_3O_{6.5}}$ (2001)
Sidis, Y., Ulrich, C., Bourges, P., Bernhard, C., Niedermayer, C., Regnault, L. P., ...
Commensurate antiferromagnetic ordering has been observed in the superconducting high-$Tc$ cuprate ${\rm YBa_{2}Cu_{3}O_{6.5}}$ (${\rm T_{c}}$=55 K) by polarized and unpolarized elastic neutron...
Optical properties of the organic metal (BEDT-TTF)4[Ni(dto)2] (2001)
Griesshaber, E., Haas, P., Thoms, J., Darjushkin, A., Gorshunov, B. P., Dressel, M., ...
Antiferromagnetic Ordering in Superconducting YBa2Cu3O6.5 (2001)
Sidis, Y., Ulrich, C., Bourges, P., Bernhard, C., Niedermayer, C., Regnault, L. P., ...
Quantification of coronary artery calcification in patients with FH using EBCT (2001)
Hoffmann, U, Bodlaj, G, Derfler, K, Bernhard, C, Wicke, L, Herold, CJ, ...
Background Calcification of the coronary vessel wall is regarded as a marker of advanced coronary atherosclerosis. Methods To test whether patients with heterozygous familial hypercholesterolemia...
Quantification of coronary artery calcification in patients with FH using EBCT (2001)
Hoffmann, U, Bodlaj, G, Derfler, K, Bernhard, C, Wicke, L, Herold, CJ, ...
Background Calcification of the coronary vessel wall is regarded as a marker of advanced coronary atherosclerosis. Methods To test whether patients with heterozygous familial hypercholesterolemia...
Antiferromagnetic Ordering in Superconducting YBa2Cu3O6.5 (2001)
Bernhard, C., Bourges, P., Niedermayer, C., Sidis, Y., Ulrich, C.
Boris, A. V., Mandal, P., Bernhard, C., Kovaleva, N. N., Pucher, K., Hemberger, J., ...
Critical behavior of the infrared reflectivity of RuSr_2GdCu_2O_8 ceramics is observed near the superconducting T_{SC} = 45 K and magnetic T_M = 133 K transition temperatures. The optical...
Bernhard, C., Tallon, J. L., Blasius, Th., Golnik, A., Niedermayer, Ch.
The doping dependence of the superconducting condensate density, n_{s}^{o}, has been studied by muon-spin-rotation for Y_{0.8}Ca_{0.2}Ba_{2}(Cu_{1-z}Zn_{z})_{3}O_{7-\delta} and...
Bernhard, C., Holden, T., Golnik, A., Lin, C. T., Cardona, M.
The far-infrared c-axis conductivity of flux-grown Y$_{1-x}$Pr$_{x}$Ba$_{2}$Cu$_{3}$O$_{7}$ single crystals with 0.2$\leq $x$\leq $0.5 has been studied by sepectral ellipsometry. We find that the...
Antiferromagnetic Order of the Ru and Gd in Superconducting RuSr2GdCu2O8 (2000)
Lynn, J. W., Keimer, B., Ulrich, C., Bernhard, C., Tallon, J. L.
Neutron diffraction has been used to study the magnetic order in RuSr{2}GdCu2O8. The Ru moments order antiferromagnetically at T{N}=136(2)K, coincident with the previously reported onset of...
Bernhard, C., Tallon, J. L., Brücher, E., Kremer, R. K.
From magnetisation measurements we provide evidence that the ferromagnetic superconductor RuSr$_{2}$GdCu$_{2}$O$_{8}$ with \QTR{it}{T}$_{c}$=45 K and \QTR{it}{T}$_{M}$=137 K exhibits a sizeable...
Low-temperature vortex structures of the mixed state in underdoped Bi2Sr2CaCu2O8+δ (2000)
Blasius, T., Niedermayer, C., Pooke, D. M., Noakes, D. R., Stronach, C. E., Ansaldo, E. J., ...
Raman scattering from magnetic excitations in ruthenate-cuprates (2000)
Hadjiev, V. G., Bernhard, C., Lin, C. T., Ruf, T., Cardona, M., Tailon, J. L.
Antiferromagnetic ordering of Ru and Gd in superconducting RuSr2GdCu2O8 (2000)
Lynn, J. W., Keimer, B., Ulrich, C., Bernhard, C., Tallon, J. L.
Soft-mode hardening in SrTiO3 thin films (2000)
Sirenko, A. A., Bernhard, C., Golnik, A., Clark, A. M., Hao, J. H., Si, W. D., ...
Heat capacity and transport studies of the ferromagnetic superconductor RuSr2GdCu2O8 (2000)
Tallon, J. L., Loram, J. W., Williams, G. V. M., Bernhard, C.
Critical doping in overdoped high-Tc superconductors - a Quantum Critical Point? (1999)
Tallon, J. L., Loram, J. W., Williams, G. V. M., Cooper, J. R., Fisher, I. R., Johnson, J. D., ...
Evidence is presented from the scaling of the Knight shift, entropy and transport properties together with the sharp peaking of condensation energy, critical currents, superfluid density and a...
Heat capacity and transport studies of the ferromagnetic superconductor RuSr2GdCu2O8 (1999)
Tallon, J. L., Loram, J. W., Williams, G. V. M., Bernhard, C.
Resistivity, thermoelectric power and heat capacity are investigated in the ferromagnetic superconductor RuSr2GdCu2O8 with and without Zn substitution. The thermodynamic signatures of the ordering of...
Bernhard, C., Munzar, D., Golnik, A., Lin, C. T., Wittlin, A., Huml{í}ček, J., ...
We have performed ellipsometric measurements of the far-infrared c-axis dielectric response of underdoped YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ single crystals. Here we report a detailed analysis of the...
Munzar, D., Bernhard, C., Golnik, A., Humlicek, J., Cardona, M.
The spectra of the far-infrared c-axis conductivity of underdoped YBCO crystals exhibit dramatic changes of some of the phonon peaks when going from the normal to the superconducting state. We show...
Blasius, T., Niedermayer, Ch., Tallon, J. L., Pooke, D. M., Golnik, A., Bernhard, C.
From muon spin rotation measurements on under- to overdoped Bi-2212 crystals we obtain evidence for a two-stage transition of the vortex matter as a function of temperature. The first transition is...
Bernhard, C., Tallon, J. L., Niedermayer, Ch., Blasius, Th., Golnik, A., Brücher, E., ...
We have investigated the magnetic and the superconducting properties of the hybrid ruthenate-cuprate compound RuSr_{2}GdCu_{2}O_{8} by means of zero-field muon spin rotation- (ZF-$\mu $SR) and DC...
Investigations of the Vortex matter in Bi2Sr2Ca1Cu2O8+δ single crystals (1999)
Barnes, S. E., Blasius, T., Niedermayer, C., Schiessling, J., Bolz, U., Eisenmenger, J., ...
The far-infrared in-plane conductivity of YBaCuO studied by ellipsometry. (1999)
Golnik, A., Bernhard, C., Humlíček, J., Kläser, M., Cardona, M.
Electronic Raman scattering in Y1-xCaxBa2Cu3O7-δ single crystals. (1999)
Martin, A. A., Hadjiev, V. G., Bernhard, C., Ruf, T., Cardona, M., Wolf, T.
Electronic Raman response of optimal and overdoped Y1-xCaxBa2Cu3O7-δ single crystals. (1999)
Martin, A. A., Hadjiev, V. G., Bernhard, C., Ruf, T., Cardona, M., Wolf, T.
Critical doping in overdoped high-Tc superconductors: a quantum critical point. (1999)
Tallon, J. L., Loram, J. W., Williams, G. V. M., Cooper, J. R., Fisher, I. R., Johnson, J. D., ...
Bernhard, C., Munzar, D., Kläser, M., Wolf, T., Lin, C.T., Cardona, M.
1st Euroconf.on Anomalous Complex Superconductors, Agia Pelagia, GR, September 26 - October 3, 1998
Bernhard, C., Munzar, D., Wittlin, A., König, W., Golnik, A., Lin, C.T., ...
Physical Review B, 59(1999) S.R6631
Electronic Raman scattering in Y§1§-§xCa§xBa§2Cu§3O§7§-§#d. (1999)
Martin, A.A., Hadjiev, V.G., Bernhard, C., Ruf, T., Cardona, M., Wolf, T.
Physica Status Solidi b, 215(1999) S.477
Martin, A.A., Hadjiev, V.G., Bernhard, C., Ruf, T., Cardona, M., Wolf, T.
Physica Status Solidi b, 214(1999) S.R21
Muon-spin-rotation study of Zn-induced magnetic moments in cuprate high-Tc superconductors. (1998)
Bernhard, C., Niedermayer, C., Blasius, T., Williams, G. V. M., DeRenzi, R., Bucci, C., ...
Bernhard, C., Henn, R., Wittlin, A., Kläser, M., Wolf, T., Müller-Vogt, G., ...
Physical Review Letter 80(1998), S.1762-1765
Phase separation, pseudogap and impurity scattering in the HTS cuprates. (1997)
Tallon, J. L., Williams, G. V. M., Flower, N. E., Bernhard, C.
Bernhard, C., Duquennoi, C., Girard, H.
This paper is a contribution to the question of the durability of geomembranes by giving the results of tests performed on samples of geomembranes taken from three existing structures after 3, 7 and...
Laboratory ageing of geomembranes in landfill leachates (1995)
Duquennoi, C., Bernhard, C., Gaumet, S.
The present paper describes a laboratory ageing experiment initiated in 1989 and covering six types of geomembranes immersed in two different municipal landfill leachates and in distillated water....
Compared performances of bottom and slope lining systems of municipal landfills (1994)
Bernhard, C., Gourc, J.P., Le Tellier, I., Matichard, Y.
The behaviour of four different landfill bottom and slope liner systems (compacted clay, HDPE geomembrane, bentonite membrane, composite clay/HDPE geomembrane) are compared mainly on the basis of...
Behaviour of lining systems on waste landfill slopes: an experimental approach (1994)
Tanays, E., Letellier, I., Bernhard, C., Gourc, J.P.
Lining systems are more and more used to provide an environmental protection to the industrial and domestic waste disposals. The behavior of such lining systems can be critical during their...
Laboratory and in situ studies on the durability of geomembranes (1994)
Bernhard, C., Girard, H., Gousse, F.
Durability is an essential question for the use of geomembranes. The paper is a contribution to this question, by using, in addition to the classic tests, a molecular approach by the FTIR analytical...
Geosynthetic materials in French industrial waste storages: new concepts (1994)
Gisbert, T., Gourc, J.P., Soyez, B., Bernhard, C.
The paper presents the use of geosynthetic materials in French industrial waste storages and the new concepts proposed according to the new regulation through two examples. The industrial waste is...
Realisation of four landfill bottom and slope liner systems in Montreuil sur Barse (1993)
Bernhard, C., Matichard, Y., Pierson, P., Le Tellier, I.
The municipal waste landfill of Montreuil sur Barse is used to study the behaviour of four different landfill bottom and slope liner systems (compacted clay, HDPE geomembrane, bentonite membrane,...
Le Tellier, I., Gourc, J.P., Bernhard, C., Matichard, Y.
The municipal waste landfill of Montreuil sur Barse is used to study the behaviour of four different landfill bottom and slope liner systems (compacted clay, HDPE geomembrane, bentonite membrane,...
Utilisation des sols argileux : propriétés, mise en oeuvre, contrôles (1993)
Bernhard, C., Gousse, F., Matichard, Y.
Clay liners consisting of several layers of compared cohesive soil may be used in waste management facilities when the native soil is not able to provide a suffisant protection to the water content,...
Real scale experimentation on the bottom and slope lining of municipal landfill (1993)
Le Tellier, I., Bernhard, C., Gourc, J.P., Matichard, Y.
The municipal waste landfill of Montreuil sur Barse is used to study the behaviour of four different landfill bottom and slope liner systems (compacted clay, HDPE geomembrane, bentonite membrane,...
Eloy Giorni, C., Beaudoing, G., Margrita, R., Pelte, T., Pierson, P., Bernhard, C.
Two measuring methods of flow through geomembranes are described : by volumetric (IRIGM, CEMAGREF) and radioisotopes methods (CENG). These are applied on PVC and HDPE geomembranes in the same...
La gestion des déchets ménagers aux USA (1992)
Dumps saturated, incinerators badly accepted by public opinion, the Americans have not solved the problem of wastes better than others. The increasing severity of the regulations on dumps and the...
Corda, R., Degoutte, G., Bernhard, C., Timblin, L.O., Morisson, W.R., Cazzuffi, D., ...
This bulletin is a true technical guide which studies the classification and characteristics of geomembranes and the constraints to which the geomembrane is exposed. It presents various...
Bursting test : validation by 2D-tension test and infrared thermography (1990)
Geomembrane bursting test is easy to conduct and requires only light, unsophisticated equipment. The material is subjected to a 2D tension in the form of spherical caps. The article gives an...
Le génie civil des bassins de lagunage naturel (1990)
This document has been conceived mainly for prime contractors to make them aware of building engineering problems and tightness problems related to lagooning catchment areas. / Ce document a été...