HIGH-TC SUPERCONDUCTORS AS IONIC METALS AND THE ROLE OF PHONONS IN HIGH-TC SUPERCONDUCTIVITY

被引：15

作者：

COHEN, RE ^{[1
]}

PICKETT, WE ^{[1
]}

KRAKAUER, H ^{[1
]}

PAPACONSTANTOPOULOS, DA ^{[1
]}

机构：

[1] COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23185

来源：

PHASE TRANSITIONS | 1990年 / 22卷 / 1-4期

基金：

美国国家科学基金会;

关键词：

electron-phonon interaction; High-temperature superconductivity; La2Cu04; lattice dynamics; total energy calculations;

D O I：

10.1080/01411599008207223

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

We have investigated a number of zone center and zone boundary (X-point) modes in La2 CuO4 using the full potential Linearized Augmented Plane Wave (LAPW) method and find excellent agreement with experiment for phonon frequencies, showing that the local density approximation (LDA) is an excellent approximation for the total energies, charge density, and static density response in high Tc superconductors. Results are compared with those of a non-empirical ionic model for La2 CuO4 and YBa2 Cu3 O7. Self-consistent calculations show that the ionic nature of these materials leads to large changes in the potential with atomic displacements. The ionic contributions to the electron-phonon matrix elements, which were neglected in previous studies, are large and possibly sufficient to explain high Tr. © 1990, Taylor & Francis Group, LLC. All rights reserved.

引用

页码：167 / 183

页数：17

共 46 条

[1] TRANSITION-TEMPERATURE OF STRONG-COUPLED SUPERCONDUCTORS REANALYZED [J].