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Penetration-Depth Anisotropy in MgB2: Two-Band Ginzburg-Landau Theory

LIU Minxia   

  1. State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871; E-mail:
  • Received:2007-06-01 Online:2008-07-20 Published:2008-07-20

MgB2穿透深度的各向异性: 两带Ginzburg-Landau 理论


  1. 北京大学物理学院,人工微结构和介观物理国家重点实验室,北京100871;

Abstract: Penetration-depth in two-band superconductors MgB2 is calculated by using two-band GL theory. It can be found that the ratio (γλ) of penetration-depth in c direction and in ab plane enhances with the increase of temperature. With the proper parameters, the theoretical result is in agreement with the experimental result at high temperature. γλ in the dirty limit is also discussed.

Key words: two-band superconductors, GL theory, MgB2, penetration depth

摘要: 用两带各向异性GL(Ginzburg-Landau)模型计算了两带超导体MgB2的穿透深度,结果表明MgB2在c方向的穿透深度与ab平面内的穿透深度的比值(γλ)随温度的升高而变大,当选取适当的参数时,在高温区理论结果与实验结果符合的很好。另外还讨论了在脏极限下γλ的情况。

关键词: 两带超导体, GL理论, MgB2, 穿透深度

CLC Number: