D. Reznik
Research Subjects
Research Interests
D. Reznik has a total of 23 co-authors. Here are the top co-authors by number of shared publications:
L. Pintschovius
Forschungszentrum Karlsruhe, Institut für Festkörperphysik, POB 3640, D-76021 Karlsruhe, Germany
3 shared publicationsK. Yamada
Institute for Material Research, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577, Japan
2 shared publicationsM. Fujita
Institute for Material Research, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577, Japan
2 shared publicationsP. Bourges
Laboratoire Léon Brillouin, CEA-CNRS, CE-Saclay, 91191 Gif sur Yvette, France
2 shared publicationsS. Tajima
Superconductivity Research Laboratory, ISTEC, Shinonome, Koutu-ku, Tokyo, 135-0062, Japan
2 shared publicationsY. Endoh
Institute for Material Research, Tohoku University, Katahira, Aoba-ku, Sendai, 980-8577, Japan
2 shared publications
Latest Publications
- 1 October 2008
- Published by Springer Nature in Nature
- Vol. 455 (7213) , E6-E7
Photoemission kinks and phonons in cuprates
- 1 October 2008
- Published by Springer Nature in Nature
- Vol. 455 (7213) , E6-E7
Photoemission kinks and phonons in cuprates
- 19 June 2008
- Published by Elsevier in Journal of Physics and Chemistry of Solids
- Vol. 69 (12) , 3103-3107
q-Dependence of the giant bond-stretching phonon anomaly in the stripe compound La1.48Nd0.4Sr0.12CuO4 measured by IXS
- 19 June 2008
- Published by Elsevier in Journal of Physics and Chemistry of Solids
- Vol. 69 (12) , 3103-3107
q-Dependence of the giant bond-stretching phonon anomaly in the stripe compound La1.48Nd0.4Sr0.12CuO4 measured by IXS
- Top Cited Papers
- 1 April 2006
- Published by Springer Nature in Nature
- Vol. 440 (7088) , 1170-1173
Electron–phonon coupling reflecting dynamic charge inhomogeneity in copper oxide superconductors
The attempt to understand copper oxide superconductors is complicated by the presence of multiple strong interactions in these systems. Many believe that antiferromagnetism is important for superconductivity, but there has been renewed interest in the possible role of electron–lattice coupling1,2,3,4. The conventional superconductor MgB2 has a very strong electron–lattice coupling, involving a particular vibrational mode (phonon) that was predicted by standard theory and confirmed quantitatively by experiment5. Here we present inelastic scattering measurements that show a similarly strong anomaly in the Cu–O bond-stretching phonon in the copper oxide superconductors La2-xSrxCuO4 (with x = 0.07, 0.15). Conventional theory does not predict such behaviour. The anomaly is strongest in La1.875Ba0.125CuO4 and La1.48Nd0.4Sr0.12CuO4, compounds that exhibit spatially modulated charge and magnetic order, often called stripe order6; it occurs at a wave vector corresponding to the charge order. These results suggest that this giant electron–phonon anomaly, which is absent in undoped and over-doped non-superconductors, is associated with charge inhomogeneity. It follows that electron–phonon coupling may be important to our understanding of superconductivity, although its contribution is likely to be indirect.
- 1 April 2006
- Published by Springer Nature in Nature
- Vol. 440 (7088) , 1170-1173
Top Cited PapersElectron–phonon coupling reflecting dynamic charge inhomogeneity in copper oxide superconductors
The attempt to understand copper oxide superconductors is complicated by the presence of multiple strong interactions in these systems. Many believe that antiferromagnetism is important for superconductivity, but there has been renewed interest in the possible role of electron–lattice coupling1,2,3,4. The conventional superconductor MgB2 has a very strong electron–lattice coupling, involving a particular vibrational mode (phonon) that was predicted by standard theory and confirmed quantitatively by experiment5. Here we present inelastic scattering measurements that show a similarly strong anomaly in the Cu–O bond-stretching phonon in the copper oxide superconductors La2-xSrxCuO4 (with x = 0.07, 0.15). Conventional theory does not predict such behaviour. The anomaly is strongest in La1.875Ba0.125CuO4 and La1.48Nd0.4Sr0.12CuO4, compounds that exhibit spatially modulated charge and magnetic order, often called stripe order6; it occurs at a wave vector corresponding to the charge order. These results suggest that this giant electron–phonon anomaly, which is absent in undoped and over-doped non-superconductors, is associated with charge inhomogeneity. It follows that electron–phonon coupling may be important to our understanding of superconductivity, although its contribution is likely to be indirect.
- 7 March 2005
- Published by American Physical Society (APS) in Physical Review B
- Vol. 71 (9) , 092301
Bond-bending and bond-stretching phonons in ferromagneticLongitudinal optical phonons with oxygen character were measured in by inelastic neutron scattering in the (1 0 0) cubic direction and results were compared with shell model predictions. Measurements were performed in several Brillouin zones, which enabled us to identify the eigenvectors independent of the shell model. All major disagreements between model predictions and experimental results are primarily due to the anomalous downward dispersion of the bond-stretching vibration. The main new result is that the rhombohedral distortion of the cubic lattice makes the bond-stretching vibrations interact strongly with bond-bending modes folded into the cubic Brillouin zone.- 7 March 2005
- Published by American Physical Society (APS) in Physical Review B
- Vol. 71 (9) , 092301
Bond-bending and bond-stretching phonons in ferromagneticLongitudinal optical phonons with oxygen character were measured in by inelastic neutron scattering in the (1 0 0) cubic direction and results were compared with shell model predictions. Measurements were performed in several Brillouin zones, which enabled us to identify the eigenvectors independent of the shell model. All major disagreements between model predictions and experimental results are primarily due to the anomalous downward dispersion of the bond-stretching vibration. The main new result is that the rhombohedral distortion of the cubic lattice makes the bond-stretching vibrations interact strongly with bond-bending modes folded into the cubic Brillouin zone.- 10 November 2004
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 93 (20) , 207003
Dispersion of Magnetic Excitations in Optimally Doped SuperconductingDetailed neutron scattering measurements of found that the resonance peak and incommensurate magnetic scattering induced by superconductivity represent the same physical phenomenon: two dispersive branches that converge near 41 meV and the in-plane wave vector to form the resonance peak. One branch has a circular symmetry around and quadratic downward dispersion from to the spin gap of . The other, of lower intensity, disperses from to at least 55 meV. Our results exclude a quartet of vertical incommensurate rods in - space expected from spin waves produced by dynamical charge stripes as an origin of the observed incommensurate scattering in optimally doped YBCO.- 10 November 2004
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 93 (20) , 207003
Dispersion of Magnetic Excitations in Optimally Doped SuperconductingDetailed neutron scattering measurements of found that the resonance peak and incommensurate magnetic scattering induced by superconductivity represent the same physical phenomenon: two dispersive branches that converge near 41 meV and the in-plane wave vector to form the resonance peak. One branch has a circular symmetry around and quadratic downward dispersion from to the spin gap of . The other, of lower intensity, disperses from to at least 55 meV. Our results exclude a quartet of vertical incommensurate rods in - space expected from spin waves produced by dynamical charge stripes as an origin of the observed incommensurate scattering in optimally doped YBCO.- Open Access
Dispersion of Magnetic Excitations in Superconducting Optimally Doped YBa_2Cu_3O_6.95
Detailed neutron scattering measurements of YBa_2Cu_3O_6.95 found that the resonance peak and incommensurate magnetic scattering induced by superconductivity represent the same physical phenomenon: two dispersive branches that converge near 41 meV and the in-plane wave-vector q_af=(pi/a, pi/a) to form the resonance peak. One branch has a circular symmetry around q_af and quadratic downward dispersion from ~41 meV to the spin gap of 33+-1meV. The other, of lower intensity, disperses from ~41 meV to at least 55 meV. Our results exclude a quartet of vertical incommensurate rods in q-w space expected from spin waves produced by dynamical charge stripes as an origin of the observed incommensurate scattering in optimally-doped YBCO.
Open AccessDispersion of Magnetic Excitations in Superconducting Optimally Doped YBa_2Cu_3O_6.95
Detailed neutron scattering measurements of YBa_2Cu_3O_6.95 found that the resonance peak and incommensurate magnetic scattering induced by superconductivity represent the same physical phenomenon: two dispersive branches that converge near 41 meV and the in-plane wave-vector q_af=(pi/a, pi/a) to form the resonance peak. One branch has a circular symmetry around q_af and quadratic downward dispersion from ~41 meV to the spin gap of 33+-1meV. The other, of lower intensity, disperses from ~41 meV to at least 55 meV. Our results exclude a quartet of vertical incommensurate rods in q-w space expected from spin waves produced by dynamical charge stripes as an origin of the observed incommensurate scattering in optimally-doped YBCO.