Effects of two-band superconductivity on the flux-line lattice in magnesium diboride

被引：86

作者：

Cubitt, R

Eskildsen, MR

Dewhurst, CD

Jun, J

Kazakov, SM

Karpinski, J

机构：

[1] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

[2] Univ Geneva, Dept Phys Mat Condensee, CH-1211 Geneva 4, Switzerland

[3] ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.91.047002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present neutron scattering from the flux line lattice (FLL) in MgB2. Between 0.5 and 0.9 T the FLL undergoes a 30degrees reorientation, and simultaneously the scattered intensity falls sharply consistent with the weaker superconducting pi band being suppressed with increasing field. We speculate that the pi and sigma bands favor different FLL orientations, and that the reorientation is driven by the suppression of the pi band. When the c axis of the crystal is rotated 45degrees to the applied field the penetration depth anisotropy could be measured, and rises both as a function of applied field and temperature.

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页数：4

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