Superconducting energy gap distribution of MgB2 investigated by point-contact spectroscopy

被引：34

作者：

Laube, F

Goll, G

Hagel, J

von Höhneysen, H

Ernst, D

Wolf, T

机构：

[1] Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany

[2] Forschungszentrum Karlsruhe, Inst Festkorperphys, D-76021 Karlsruhe, Germany

来源：

EUROPHYSICS LETTERS | 2001年 / 56卷 / 02期

关键词：

D O I：

10.1209/epl/i2001-00519-4

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We performed point-contact spectroscopy on the binary superconductor MgB2. The differential conductance shows gap-related structures which vary in width and position from contact to contact. The distribution of energy gaps shows a distinct accumulation around 1.7 and 7 meV which is associated with the occurrence of a small and a large energy gap in MgB2. While with increasing T the structure in dI/dV associated with the small gap is present up to T-c, in magnetic field it is suppressed well below B-c2.

引用

页码：296 / 301

页数：6