Temperature dependence and anisotropy of the bulk upper critical field Hc2 of MgB2 -: art. no. 180505

被引：111

作者：

Sologubenko, AV ^{[1
]}

Jun, J ^{[1
]}

Kazakov, SM ^{[1
]}

Karpinski, J ^{[1
]}

Ott, HR ^{[1
]}

机构：

[1] ETH Honggerberg, Festkorperphys Lab, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW B | 2002年 / 65卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.65.180505

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The bulk upper critical field H-c2(T) of superconducting MgB2 and its anisotropy are established by analyzing experimental data on the temperature and magnetic-field dependences of the ab-plane thermal conductivity of a single-crystalline sample in external magnetic fields oriented both parallel (H-c2(c)) and perpendicular (H-c2(ab)) to the c axis of the hexagonal lattice. From numerical fits we deduce the anisotropy ratio gamma(0)=H-c2(ab)(0)/H-c2(c)(0)=4.2 at T=0 K. Both the values and the temperature dependences of H-c2(c) and H-c2(ab) are distinctly different from previous claims based on measurements of the electrical resistivity.

引用

页码：1 / 4

页数：4

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