Tunneling spectroscopy on correlated electron systems

被引：12

作者：

Aarts, J. ^{[1
]}

Volodin, A. P. ^{[1
]}

机构：

[1] Leiden Univ, Kamerlingh Onnes Lab, POB 9506, NL-2300 RA Leiden, Netherlands

来源：

PHYSICA B-CONDENSED MATTER | 1995年 / 206卷

关键词：

D O I：

10.1016/0921-4526(94)00363-Z

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Different current methods for tunneling spectroscopy are discussed. Spectroscopic measurements at low temperatures involving either vacuum tunneling or 'small-junction' tunneling are presented on different systems which show gaps in their density of states. In the Kondo insulators FeSi and CeNiSn, we found gaps 2 Delta of about 100 meV and 10 meV, respectively. In the heavy fermion materials UPd2Al3 and URu2Si2, we found gaps of about 10 meV below the antiferromagnetic ordering when tunneling along the ab planes. No gap was found along the c-axis, so that the normal state of these superconductors appears strongly anisotropic.

引用

页码：43 / 48

页数：6

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