EXPERIMENTAL PROOF OF A TIME-REVERSAL-INVARIANT ORDER-PARAMETER WITH A PI-SHIFT IN YBA2CU3O7-DELTA

被引：230

作者：

MATHAI, A

GIM, Y

BLACK, RC

AMAR, A

WELLSTOOD, FC

机构：

[1] Center for Superconductivity Research, Department of Physics, University of Maryland, College Park

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 74卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.74.4523

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

To determine the symmetry of the order parameter in superconducting YBa2Cu3O7-δ (YBCO), we use a scanning SQUID microscope at 4.2 K to perform independent experiments on six YBCO-Ag-Pb SQUIDs. We find completely unambiguous evidence for a time-reversal-invariant order parameter with a phase shift of π between the a and b directions of YBCO. Our results are inconsistent with purely s-wave symmetric pairing and are strongly suggestive of dx2-y2 symmetric pairing in YBCO. © 1995 The American Physical Society.

引用

页码：4523 / 4526

页数：4

共 17 条

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