Origin of superconductivity transition broadening in MgB2

被引:31
作者
Masui, T [1 ]
Lee, S [1 ]
Tajima, S [1 ]
机构
[1] ISTEC, Superconduct Res Lab, Tokyo 1350062, Japan
来源
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2003年 / 383卷 / 04期
关键词
MgB2; resistivity; critical field; anisotropy;
D O I
10.1016/S0921-4534(02)02049-X
中图分类号
O59 [应用物理学];
学科分类号
摘要
We report resistivity and magnetization of single crystal MgB2, focusing on the broadening of superconducting (SC) transition in magnetic fields. In-plane and out-of-plane resistivity indicate that the broadening of SC transition is independent of Lorentz force and that it is merely dependent on the magnetic field direction. In magnetization, diamagnetic signal begins to appear at almost the same temperature as the onset temperature of resistivity transition. These results suggest that the broadening is attributed not to the surface superconductivity but to the SC fluctuation or the vortex-liquid picture, owing to the short coherence length and the high transition temperature of MgB2. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:299 / 305
页数:7
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