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
基金：
美国国家科学基金会;
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
收藏
页码：154 / 161
页数：8
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