C-13 NMR-STUDY OF A QUASI-2-DIMENSIONAL ORGANIC SUPERCONDUCTOR K-(ET)2CU[N(CN)2]BR

被引：152

作者：

MAYAFFRE, H

WZIETEK, P

LENOIR, C

JEROME, D

BATAIL, P

机构：

[1] Laboratoire de Physique des Solides, Université Paris-Sud, Orsay

来源：

EUROPHYSICS LETTERS | 1994年 / 28卷 / 03期

关键词：

D O I：

10.1209/0295-5075/28/3/009

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present C-13 NMR measurements carried out under pressure and between 10 and 300 K on a single crystal of the organic superconductor kappa-(ET)2Cu[N(CN)2]Br. Under pressure, the large variation of the Knight shift is interpreted as the presence of electronic correlations. We estimate the U/W ratio to be of order unity. As regards temperature, we report a large enhancement of 1/T1 T and a drop of Knight shift near 50 K. These anomalies tend to disappear under pressure, all properties becoming more usual for a metal. These results are seen to be similar to those observed in the high-T(c) superconductors. We propose that nesting properties of the Fermi surface can qualitatively explain this behaviour.

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页码：205 / 210

页数：6

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