Ginzburg-Landau theory of vortices in a multigap superconductor

被引：208
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.
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页数：11
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