Anisotropic properties of MgB2 by torque magnetometry

被引：1

作者：

Angst, M

Di Castro, D

Puzniak, R

Wisniewski, A

Jun, J

Kazakov, SM

Karpinski, J

Kohout, S

Keller, H

机构：

[1] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

[2] ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland

[3] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2004年 / 408卷

关键词：

MgB2; anisotropy; upper critical field; penetration depth; torque;

D O I：

10.1016/j.physc.2004.02.045

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Anisotropic properties of superconducting MgB2 obtained by torque magnetometry are compared to theoretical predictions, concentrating on two issues. Firstly, the angular dependence of H-c2 is shown to deviate close to T-c from the dependence assumed by anisotropic Ginzburg-Landau theory. Secondly, from the evaluation of torque vs angle curves it is concluded that the anisotropy of the penetration depth gamma(lambda) has to be substantially higher at low temperature than theoretical estimates, at least in fields higher than 0.2 T. (C) 2004 Elsevier B.V. All rights reserved.

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页码：88 / 89

页数：2

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