Vortex-glass transition and fishtail effect in the cubic (K,Ba)BiO3 superconductor

被引:4
|
作者
Joumard, I
Klein, T
Samuely, P
Szabo, P
Jansen, AGM
Fillion, G
Rakoto, H
Broto, JM
Marcus, J
机构
[1] CNRS, LEPES, F-38042 Grenoble 9, France
[2] Slovak Acad Sci, Inst Phys Expt, SK-04353 Kosice, Slovakia
[3] CNRS, MPI, High Field Magnet Lab, F-38042 Grenoble 9, France
[4] CNRS, Lab Louis Neel, F-38042 Grenoble 9, France
[5] SNCMP, LPS, F-31077 Toulouse, France
来源
PHYSICA C | 1999年 / 317卷
关键词
vortex-glass transition; superconductor; magnetization;
D O I
10.1016/S0921-4534(99)00093-3
中图分类号
O59 [应用物理学];
学科分类号
摘要
We present the H-T phase diagram of the cubic (K,Ba)BiO3 high T-c superconductor (T-c similar to 30 K). We show that the vortex solid melts into a liquid phase for T > T-g(H) through a second order phase transition which can be well described by the vortex-glass transition scaling laws down to the lowest temperatures. Moreover, as usually observed in other high T-c materials, the 'apparent' critical current deduced from the width of the magnetization loops present a non monotonic behavior (so-called 'fishtail effect'). The position of the peak is time-independent at low temperature but disappears for long waiting times above similar to T-c/2. This may be related to a sharp increase of the relaxation rate in the vicinity of the vortex-glass transition line. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:436 / 440
页数:5
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