Linear low temperature spin susceptibility in the underdoped high T-c superconductor, Gd:YBa2Cu4O8

被引：14

作者：

Janossy, A

Feher, T

Oszlanyi, G

Williams, GVM

机构：

[1] SOLID STATE PHYS RES INST, H-1525 BUDAPEST, HUNGARY

[2] IND RES LTD, LOWER HUTT, NEW ZEALAND

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.79.2726

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The uniform spin susceptibility, chi(s), is determined from the Gd3+ high frequency ESR Knight shift in the underdoped high temperature superconductor, Gd:YBa2Cu4O8 (T-c = 82 K) between 8 to 260 K. Measurements at two fields (5.4 and 8.1 T) permit high precision at low temperatures. In the range of 0.1T(c) to 0.4T(c), a linear temperature dependence of chi(s) is observed with a large slope. The corresponding maximum d-wave superconducting gap is Delta(0) = 190 K, 1.1 times the weakly coupled d-wave limit. The results support suggestions that the normal state gap observed below 180 K and the superconducting gap below T-c have nodes with the same symmetry.

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收藏

页码：2726 / 2729

页数：4

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