ENHANCED ELECTRON-PHONON COUPLING AND ITS IRRELEVANCE TO HIGH T-C SUPERCONDUCTIVITY

Authors
DEVEREAUX TP VIROSZTEK A ZAWADOWSKI A OPEL M MULLER PF HOFFMANN C PHILIPP R NEMETSCHEK R HACKL R ERB A WALKER E BERGER H FORRO L
Citation
Tp. Devereaux et al., ENHANCED ELECTRON-PHONON COUPLING AND ITS IRRELEVANCE TO HIGH T-C SUPERCONDUCTIVITY, Solid state communications, 108(7), 1998, pp. 407-411
Citations number
19
Categorie Soggetti
Physics, Condensed Matter
Journal title
Solid state communications → ACNP
ISSN journal
00381098
Volume
108
Issue
7
Year of publication
1998
Pages
407 - 411
Database
ISI
SICI code
0038-1098(1998)108:7<407:EECAII>2.0.ZU;2-V
Abstract
It is argued that the origin of the buckling of the CuO2 planes in cer tain 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 at oms with different valence above and below. The magnitude of the elect ric field is deduced from new Raman results on YBa2Cu3O6+x and Bi2Sr2( Ca1 - xYx)Cu2O8 With different O and Y doping, respectively. In the la tter case it is shown that the symmetry breaking by replacing Ca parti ally by Y enhances the coupling by an order of magnitude, while the su perconducting Te drops to about two third of its original value. (C) 1 998 Elsevier Science Ltd. All rights reserved.