Direct observations of vortices in a high-Tc superconductor (La1-xSrx)2CuO4 by scanning SQUID microscopy

被引：6
|
作者：
Kasai, J. [1 ]
Okazaki, N. [3 ]
Togawa, Y. [2 ]
Sasagawa, T. [2 ]
Shimoyama, J. [2 ]
Kishio, K. [2 ]
Koinuma, H. [1 ,3 ]
Hasegawa, T. [1 ,3 ,4 ]
机构：
[1] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan
[2] Univ Tokyo, Dept Superconduct, Bunkyo Ku, Tokyo 1138656, Japan
[3] COMET, Tsukuba, Ibaraki 3050044, Japan
[4] Japan Sci & Technol Corp, CREST, Tokyo, Japan
来源：
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2001年 / 72卷 / Suppl 2期
关键词：
PACS: 61.16.Ch; 74.60.Ge; 74.72.Dn;
D O I：
10.1007/s003390100667
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In order to investigate the behavior of vortices in high-T(c) superconductors under low magnetic fields, we have performed scanning SQUID microscopy (SSM) on the ab-surfaces of (La(1-x)Sr(x))(2)CuO(4) (LSCO) single crystals at low temperatures. The observed magnetic images clearly demonstrated vortices in units of Phi(0) (= hc/2e) below T(c). Vortices trapped inside the overdoped LSCO tended to be arranged in a one-dimensional manner, while those in optimally doped crystals were randomly distributed. From the variable-temperature SSM measurements, it was directly visualized that the normal state with regular magnetic-field distribution gradually changed into the inhomogeneous Meissner state, and finally vortices evolved, with decreasing temperature.
引用
收藏
页码：S263 / S266
页数：4
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