High-frequency behavior of metallic glass NixNb1-x point-contacts

被引：3

作者：

Balkashin, OP

Yanson, IK

Halbritter, A ^{[1
]}

Mihály, G

机构：

[1] Budapest Univ Technol & Econ, Inst Phys, Dept Phys, H-1111 Budapest, Hungary

[2] B Verkin Inst Low Temp Phys & Engn, UA-61164 Kharkov, Ukraine

来源：

SOLID STATE COMMUNICATIONS | 2001年 / 118卷 / 12期

基金：

美国国家科学基金会;

关键词：

disordered systems; tunnelling; Kondo effects;

D O I：

10.1016/S0038-1098(01)00188-0

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Electron - two level system interaction in Ni59Nb41 metallic glass point contacts is studied by means of conventional and high-frequency point-contact spectroscopy, at frequencies of 3.6 kHz, 0.78 GHz and 64 GHz. The amplitude of the zero bias anomaly exhibits only a 25% decrease under microwave irradiation of 64 GHz. This implies that elastic electron interaction with highly-asymmetric slow two-level fluctuators explains only a small part in the anomaly, and the main contribution is due to fast nonmagnetic Kondo-like scattering. Point contacts of Ni44Nb56 in the superconducting state were also studied. The value of the energy gap was evaluated as Delta (0) similar to 0.4 meV. Under microwave irradiation with increasing power a gradual decrease of the critical current was observed. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：623 / 627

页数：5