Vortex imaging in the π band of magnesium diboride -: art. no. 187003

被引：247

作者：

Eskildsen, MR

Kugler, M

Tanaka, S

Jun, J

Kazakov, SM

Karpinski, J

Fischer, O

机构：

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

[2] Saga Univ, Dept Phys, Saga 8408502, Japan

[3] Swiss Fed Inst Technol, Solid State Phys Lab, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.89.187003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report scanning tunneling spectroscopy imaging of the vortex lattice in single crystalline MgB2. By tunneling parallel to the c axis, a single superconducting gap (Delta=2.2 meV) associated with the pi band is observed. The vortices in the pi band have a large core size compared to estimates based on H-c2 and show an absence of localized states in the core. Furthermore, superconductivity between the vortices is rapidly suppressed by an applied field. These results suggest that superconductivity in the pi band is, at least partially, induced by the intrinsically superconducting sigma band.

引用

页数：4

共 25 条

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