Ginzburg-Landau theory of vortices in a multigap superconductor

被引：212

作者：

Zhitomirsky, ME ^{[1
]}

Dao, VH ^{[1
]}

机构：

[1] Commiss Energie Atom, DSM, DRFM, SPSMS, F-38054 Grenoble 9, France

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.69.054508

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Ginzburg-Landau functional for a two-gap superconductor is derived within the weak-coupling BCS model. The interaction between the two condensates is described by a unique Josephson-type mixing term. The two-gap Ginzburg-Landau theory is then applied to investigate various magnetic properties of MgB2 including an upturn temperature dependence of the transverse upper critical field and a core structure of an isolated vortex. The orientation of vortex lattice relative to crystallographic axes is studied for magnetic fields parallel to the c axis. A peculiar 30degrees rotation of the vortex lattice with increasing strength of an applied field observed by neutron scattering is attributed to the multigap nature of superconductivity in MgB2.

引用

页数：11

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