中国物理B ›› 2007, Vol. 16 ›› Issue (3): 826-833.doi: 10.1088/1009-1963/16/3/045

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The upper critical field in two-band layered superconductors

刘敏霞, 甘子钊   

  1. School of Physics, State Key Laboratory for Mesoscopic Physics,Peking University, Beijing\,\ 100871, China
  • 收稿日期:2006-07-27 修回日期:2006-09-14 出版日期:2007-03-20 发布日期:2007-03-20
  • 基金资助:
    Project supported by the National Basic Research Program of China (973 Program) (Grant No 2006CB601002).

The upper critical field in two-band layered superconductors

Liu Min-Xia(刘敏霞) and Gan Zi-Zhao(甘子钊)†   

  1. School of Physics, State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, China
  • Received:2006-07-27 Revised:2006-09-14 Online:2007-03-20 Published:2007-03-20
  • Supported by:
    Project supported by the National Basic Research Program of China (973 Program) (Grant No 2006CB601002).

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摘要： The upper critical field of clean MgB2 is investigated using the two-band layered Ginzburg--Landau (GL) theory. The calculated results are fitted to the experimental data of clean MgB2 crystal very well in a broad temperature range. Based on the GL theory for clean superconductors, a phenomenological theory for dirty superconductor is proposed. Selecting appropriate parameters, two-band layered GL theory is successfully applied to the crystal of Mg(B1-xCx)2 and the neutron irradiation samples of MgB2.

关键词: MgB2, Ginzburg--Landau theory, the upper critical field

Abstract: The upper critical field of clean MgB2 is investigated using the two-band layered Ginzburg--Landau (GL) theory. The calculated results are fitted to the experimental data of clean MgB2 crystal very well in a broad temperature range. Based on the GL theory for clean superconductors, a phenomenological theory for dirty superconductor is proposed. Selecting appropriate parameters, two-band layered GL theory is successfully applied to the crystal of Mg(B1-xCx)2 and the neutron irradiation samples of MgB2.

Key words: MgB2, Ginzburg--Landau theory, the upper critical field

中图分类号:  (Mixed states, critical fields, and surface sheaths)

  • 74.25.Op
74.20.De (Phenomenological theories (two-fluid, Ginzburg-Landau, etc.)) 74.25.Ha (Magnetic properties including vortex structures and related phenomena) 74.70.Ad (Metals; alloys and binary compounds)