LARGE A-B ANISOTROPY OF THE EXPANSIVITY ANOMALY AT TC IN UNTWINNED YBA2CU3O7-DELTA

被引：170

作者：

MEINGAST, C

KRAUT, O

WOLF, T

WUHL, H

ERB, A

MULLERVOGT, G

机构：

[1] UNIV KARLSRUHE,KRISTALL & MAT LAB,W-7500 KARLSRUHE,GERMANY

[2] UNIV KARLSRUHE,FAK PHYS,W-7500 KARLSRUHE,GERMANY

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 67卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.67.1634

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The response of the YBa2Cu3O7-delta lattice to superconducting order is studied using an ultrahigh-resolution capacitance dilatometer. The onset of superconductivity is accompanied by highly anisotropic jumps of the expansivities in the a-b plane. This leads to a reduction of the orthorhombic splitting below T(c), which suggests that superconductivity favors a symmetric (b = a) CuO2 plane. Little effect is seen along the c axis. Superconducting fluctuations are for the first time clearly observed in the lattice expansion.

引用

页码：1634 / 1637

页数：4

共 24 条

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