Superconducting phase diagram of single-crystal MgB2

被引：32

作者：

Welp, U ^{[1
]}

Rydh, A

Karapetrov, G

Kwok, WK

Crabtree, GW

Marcenat, C

Paulius, LM

Lyard, L

Klein, T

Marcus, J

Blanchard, S

Samuely, P

Szabo, P

Jansen, AGM

Kim, KHP

Jung, CU

Lee, HS

Kang, B

Lee, SI

机构：

[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[2] CEA Grenoble, SPSMS, Dept Rech Fondamentale Mat Condensee, F-38054 Grenoble, France

[3] CNRS, Lab Etude Proprietes Solides, F-38042 Grenoble, France

[4] Slovak Acad Sci, Inst Expt Phys, SK-04353 Kosice, Slovakia

[5] Max Planck Inst Festkorperforsch, Grenoble High Magnet Field Lab, CNRS, F-38042 Grenoble 9, France

[6] Pohang Univ Sci & Technol, Dept Phys, NCRICS, Pohang 790784, South Korea

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2003年 / 385卷 / 1-2期

关键词：

vortex phase diagram; specific heat; transport; magnetization; upper critical field; anisotropy; single crystal;

D O I：

10.1016/S0921-4534(02)02329-8

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The superconducting phase diagram of single-crystal MgB2 has been determined using magnetization, magneto-transport and specific heat measurements. A value of 9.4 nm is found for the zero-temperature in-plane coherence length. The superconducting anisotropy coefficient, gamma, increases monotonously from a value around 2 near T-c to 4.5 at low temperature. The current dependence and angular dependence of the resistive transitions give evidence for a surface superconducting state for H parallel to c which might account for the wide spread in reported values of the superconducting anisotropy. (C) 2002 Published by Elsevier Science B.V.

引用

页码：154 / 161

页数：8

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