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
相关论文
共 50 条
  • [31] Theoretical analysis of tunneling experiments in the MgB2 system
    A. E. Karakozov
    E. G. Maksimov
    Ya. G. Ponomarev
    JETP Letters, 2010, 91 : 24 - 29
  • [32] Tunneling spectroscopy and magnetization measurements of the superconducting properties of MgB2 -: art. no. 220508
    Sharoni, A
    Felner, I
    Millo, O
    PHYSICAL REVIEW B, 2001, 63 (22)
  • [33] MECHANICAL SPECTROSCOPY OF MgB2 CONTAINING SiC
    Silva, M. R.
    Silva, L. B. S.
    Rodrigues Junior, D.
    Grandini, C. R.
    ARCHIVES OF METALLURGY AND MATERIALS, 2015, 60 (04) : 3083 - 3086
  • [34] Point-contact spectroscopy of MgB2
    Samuely, P
    Szabó, P
    Kacmarcík, J
    Klein, T
    Jansen, AGM
    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2003, 385 (1-2): : 244 - 254
  • [35] MgB2 thin films and MgB2/AlN/MgB2 SIS junctions
    Shimakage, H
    Wang, Z
    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2006, 435 (1-2): : 66 - 70
  • [36] Scanning laser microscopy of an MgB2 superconducting sensor
    Arai, Kohei
    Akita, Yukio
    Yagi, Ikutaro
    Yotsuya, Tsutomu
    Shimakage, Hisashi
    Miki, Shigehito
    Wang, Zhen
    Satoh, Kazuo
    Uno, Mayumi
    Ishida, Takekazu
    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2010, 470 : S1023 - S1024
  • [37] Superconducting gap parameters of MgB2 obtained on MgB2/Ag and MgB2/In junctions
    Plecenik, A
    Benacka, S
    Kús, P
    Grajcar, M
    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2002, 368 (1-4): : 251 - 254
  • [38] Fine structure in the tunneling characteristic of MgB2 thin films
    Schneider, R.
    Geerk, J.
    Zaitsev, A. G.
    Loehneysen, H. V.
    APPLIED PHYSICS LETTERS, 2007, 91 (02)
  • [39] Superconducting gap in polycrystalline MgB2 studied by electron tunneling
    Takasaki, T
    Ekino, T
    Muranaka, T
    Fujii, H
    Akimitsu, J
    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2002, 378 : 229 - 233
  • [40] Effects of Andreev scattering on the tunneling conductance in superconducting MgB2
    Maki, K
    Gerami, R
    Haas, S
    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2002, 63 (6-8) : 1501 - 1504
12345