HIGH-TEMPERATURE SUPERCONDUCTIVITY - THE ROLES OF SOFT-PHONON DRIVEN STRUCTURAL PHASE-TRANSITIONS AND BIPHONON-ELECTRON COUPLING

被引：12
作者：
BUSSMANNHOLDER, A
BISHOP, AR
机构：
[1] UNIV BAYREUTH, W-8580 BAYREUTH, GERMANY
[2] UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, ADV STUDIES PROGRAM HIGH TEMP SUPERCONDUCT, LOS ALAMOS, NM 87545 USA
来源：
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER | 1992年 / 86卷 / 02期
关键词：
D O I：
10.1007/BF01313824
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
For the first time, fully self-consistent soft phonon data, associated with the tetragonal-orthorhombic structural transition in the high-temperature superconductor La2-xSrxCuO4, are used to solve Eliashberg equations. It is found that the electron-phonon coupling constant is strongly x- and temperature-dependent. The superconducting transition temperature T(c) follows the experimental x-dependence but does not exceed 28 K. The higher T(c) values observed are attributed to nonlinear electron-phonon interactions, due to high oxygen ion polarizability, which produce biphonon resonances and bound states and significantly increase T(c).
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页码：183 / 186
页数：4
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