Directional scanning tunneling spectroscopy in MgB2

被引：11
|
作者：
Ivarone, M [1 ]
Karapetrov, G
Koshelev, AE
Kwok, WK
Crabtree, GW
Hinks, DG
Cook, R
Kang, WN
Choi, EM
Kim, HJ
Lee, SI
机构：
[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
[2] Pohang Univ Sci & Technol, NCRICS, Pohang 790784, South Korea
[3] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2003年 / 385卷 / 1-2期
关键词：
STM; scanning tunneling spectroscopy; multi-gap superconductivity;
D O I：
10.1016/S0921-4534(02)02315-8
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The superconductivity in MgB2 has a two-band character with the dominating band having a 2D character and the second band being isotropic in the three dimensions. We use tunneling microscopy and spectroscopy to reveal the two distinct energy gaps at Delta(1) = 2.3 meV and Delta(2) = 7.1 meV. Different spectral weights of the partial superconducting density of states are a reflection of different tunneling directions in this multi-band system. The results are consistent with the existence of two-band superconductivity in the presence of strong interband superconducting pair interaction and quasiparticle scattering. The temperature evolution of the tunneling spectra shows both gaps vanishing at the bulk T-c. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：215 / 220
页数：6
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