EVIDENCE FOR AN AXIAL OXYGEN-CENTERED LATTICE FLUCTUATION ASSOCIATED WITH THE SUPERCONDUCTING TRANSITION IN YBA2CU3O7

被引：258

作者：

DELEON, JM

CONRADSON, SD

BATISTIC, I

BISHOP, AR

机构：

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 65卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.65.1675

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The axial oxygen contributions to the Cu K-edge, polarized, extended x-ray-absorption fine structure of YBa2Cu3O7 are analyzed from 10T105 K, using a novel approach in which the radial distribution function is directly calculated from model potentials. The best fit is obtained with a double-well potential with two nearly equally populated O(4) sites 0.13 apart. The site separation decreases 0.02 in a region near Tc. This perturbation in the structure is accompanied by a large increase of the tunneling frequency of 1/480 K between the two wells, suggesting a coupling between superconducting fluctuations and nonlinear phonons. © 1990 The American Physical Society.

引用

页码：1675 / 1678

页数：4

共 27 条

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