Pseudogap and superconducting fluctuations in Bi2Sr2CaCu2O8+y probed by 63Cu NMR

被引：8

作者：

Tokunaga, Y ^{[1
]}

Ishida, K

Yoshida, K

Mito, T

Kitaoka, Y

Nakayama, Y

Shimoyama, J

Kishio, K

Narikiyo, O

Miyake, K

机构：

[1] Osaka Univ, Grad Sch Engn Sci, Toyonaka, Osaka 5608531, Japan

[2] Univ Tokyo, Dept Superconduct, Bunkyo Ku, Tokyo 113, Japan

来源：

PHYSICA B | 2000年 / 284卷

基金：

日本学术振兴会;

关键词：

Bi-2212; NMR; pseudogap;

D O I：

10.1016/S0921-4526(99)02328-5

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report temperature dependence of the Gaussian component of spin-echo decay rate (1/T-2G) in single crystals Bi2Sr2 CaCu2O8+y(Bi2212). We found that 1/T-2G starts to decrease at a certain temperature, T-c*, which is higher than T-c and lower than the pseudogap temperature, T*, suggesting the formation of local Cooper pairing without global phase coherency. Based on our NMR results, we develop the phase diagram in the Bi2212 system which includes three crossover temperatures, T-mK T* and T-c*. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：663 / 664

页数：2

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