Vortex imaging in magnesium diboride with H⊥c -: art. no. 100508

被引：33

作者：

Eskildsen, MR

Jenkins, N

Levy, G

Kugler, M

Fischer, O

Jun, J

Kazakov, SM

Karpinski, J

机构：

[1] Univ Geneva, DPMC, CH-1211 Geneva 4, Switzerland

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

来源：

PHYSICAL REVIEW B | 2003年 / 68卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.68.100508

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have performed scanning tunneling spectroscopy imaging of vortices in MgB2 with both the tunneling current and the applied field perpendicular to the crystalline c axis. This revealed a well ordered vortex lattice with a relatively low anisotropy of 1.19+/-0.04. This is significantly below the upper-critical-field anisotropy, but in good agreement with theoretical predictions for the penetration depth anisotropy, which at low fields is expected to be dominated by the pi band. The value of the anisotropy is smaller than estimated from small-angle neutron-scattering measurement.

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