EVIDENCE FOR THE ROLE OF FLUXOIDS IN ENHANCING NMR SPIN-LATTICE RELAXATION AND IMPLICATIONS FOR INTRINSIC PINNING OF THE FLUX LATTICE IN ORGANIC SUPERCONDUCTORS

被引：52

作者：

DESOTO, SM

SLICHTER, CP

WANG, HH

GEISER, U

WILLIAMS, JM

机构：

[1] UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801

[2] ARGONNE NATL LAB,DIV CHEM & MAT SCI,ARGONNE,IL 60439

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.70.2956

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The authors report H-1 NMR spin-lattice relaxation rates, T1(-1), in the quasi-2D organic superconductor kappa-(ET)2Cu[N(CN)2]Br (T(c)=11.6 K), for an aligned single crystal. The relaxation in the normal state obeys the Korringa law (T1T=const). In the superconducting state, for weak fields (H0 almost-equal-to 0.59 T), T1(-1) is greatly enhanced and displays strong orientation dependence for field directions nearly parallel to the superconducting layers. This behavior indicates that motion of the fluxoid system is the cause of the extra relaxation, and is evidence for a ''lock-in'' transition of the flux lattice.

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页码：2956 / 2959

页数：4

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