Enhanced electron-phonon coupling and its irrelevance to high Tc superconductivity

被引：21

作者：

Devereaux, TP ^{[1
]}

Virosztek, A

Zawadowski, A

Opel, M

Muller, PF

Hoffmann, C

Philipp, R

Nemetschek, R

Hackl, R

Erb, A

Walker, E

Berger, H

Forro, L

机构：

[1] George Washington Univ, Dept Phys, Washington, DC 20052 USA

[2] Tech Univ Budapest, Inst Phys, Hungarian Acad Sci, H-1521 Budapest, Hungary

[3] Tech Univ Budapest, Res Grp, Hungarian Acad Sci, H-1521 Budapest, Hungary

[4] Hungarian Acad Sci, Solid State Phys Res Inst, H-1525 Budapest, Hungary

[5] Bayer Akad Wissensch, Walther Meissner Inst, D-85748 Garching, Germany

[6] Univ Geneva, DPMC, CH-1211 Geneva, Switzerland

[7] Ecole Polytech Fed Lausanne, Ecublens, CH-1015 Lausanne, Switzerland

来源：

SOLID STATE COMMUNICATIONS | 1998年 / 108卷 / 07期

基金：

匈牙利科学研究基金会;

关键词：

high-T-c superconductors; crystal and ligand fields; electron-phonon interactions; inelastic light scattering;

D O I：

10.1016/S0038-1098(98)00424-4

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

It is argued that the origin of the buckling of the CuO2 planes in certain cuprates as well as the strong electron-phonon coupling of the B-1g phonon is due to the electric field across the planes induced by atoms with different valence above and below. The magnitude of the electric field is deduced from new Raman results on YBa2Cu3O6+x and Bi2Sr2(Ca1 - xYx)Cu2O8 With different O and Y doping, respectively. In the latter case it is shown that the symmetry breaking by replacing Ca partially by Y enhances the coupling by an order of magnitude, while the superconducting Te drops to about two third of its original value. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：407 / 411

页数：5

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