Penetration depth anisotropy in MgB2 single crystals and powders

被引：3
|
作者：
Cubitt, R
Dewhurst, CD
Eskildsen, MR
Levett, SJ
Matadeen, A
Jun, J
Kazakov, SM
Karpinski, J
Bud'ko, SL
Anderson, NE
Canfield, PC
机构：
[1] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
[2] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA
[3] ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland
[4] Ames Lab, Ames, IA 50011 USA
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2006年 / 67卷 / 1-3期
关键词：
superconductors; neutron scattering;
D O I：
10.1016/j.jpcs.2005.10.042
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We present small-angle neutron scattering (SANS) measurements of the vortex lattice in single crystal and powder samples of MgB2-a two band superconductor. SANS is a powerful method allowing us to measure directly the distribution of vortex separations and hence the anisotropy of the penetration depth, gamma(lambda). Single crystal results show the expected rise of gamma(lambda), with applied field as the weaker, almost isotropic, pi-band is suppressed. Results from the powder samples do not show as significant a rise in gamma(lambda) with field. We believe this originates from 'averaged' properties of the penetration depth experienced by vortices in each multi-crystallite powder grain. (c) 2005 Published by Elsevier Ltd.
引用
收藏
页码：493 / 496
页数：4
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