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Chinese Physics, 2007, Vol. 16(3): 826-833    DOI: 10.1088/1009-1963/16/3/045
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

The upper critical field in two-band layered superconductors

Liu Min-Xia(刘敏霞) and Gan Zi-Zhao(甘子钊)
School of Physics, State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, China
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.
Keywords:  MgB2      Ginzburg--Landau theory      the upper critical field  
Received:  27 July 2006      Revised:  14 September 2006      Accepted manuscript online: 
PACS:  74.25.Op (Mixed states, critical fields, and surface sheaths)  
  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)  
Fund: Project supported by the National Basic Research Program of China (973 Program) (Grant No 2006CB601002).

Cite this article: 

Liu Min-Xia(刘敏霞) and Gan Zi-Zhao(甘子钊) The upper critical field in two-band layered superconductors 2007 Chinese Physics 16 826

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