Angular position of nodes in the superconducting gap of YBCO

被引：119

作者：

Aubin, H ^{[1
]}

Behnia, K ^{[1
]}

Ribault, M ^{[1
]}

Gagnon, R ^{[1
]}

Taillefer, L ^{[1
]}

机构：

[1] MCGILL UNIV,DEPT PHYS,MONTREAL,PQ H3A 2T8,CANADA

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.78.2624

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The thermal conductivity of a YBa2Cu3O6.9 detwinned single crystal has been studied as a function of the relative orientation of the crystal axes and a magnetic field rotating in the Cu-O planes. Measurements were carried out at several different temperatures below T-c for a field of 30 kOe. A fourfold symmetry characteristic of a superconducting gap with nodes at odd multiples of 45 degrees in k space was resolved. Experiments were performed to exclude a possible macroscopic origin for such a fourfold symmetry and our results impose an upper limit of 10% on the weight of the s-wave component of the essentially d-wave superconducting order parameter of YBCO.

引用

页码：2624 / 2627

页数：4

共 29 条

[1]

ANDREEV AF, 1964, SOV PHYS JETP-USSR, V19, P1228

[2]

ANNETT J, INPRESS PHYSICAL PRO, V5

[3]

ATKINSON W, IN PRESS P BICAS SUM

[4] Anisotropic superconductivity: (s+d)-wave model, (d+s)-wave model and the effect of normal impurities [J].