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Mixed state in dirty two-band superconductors: application to MgB2
 

Summary: Mixed state in dirty two-band superconductors:
application to MgB2
A.A. Golubov a,*, A.E. Koshelev b
a
Department of Applied Physics, Faculty of Science and Technology, University of Twente, P.O. Box 217,
7500 AE Enschede, The Netherlands
b
Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA
Abstract
We investigate a two-band superconductor with strong intraband and weak interband electronic scattering rates in
the framework of coupled Usadel equations. We calculate the upper critical field for different field orientation. Due to a
very large difference between the c-axis coherence lengths in two-bands, the GL theory is applicable only in the ex-
tremely narrow temperature range. This leads to the strong temperature dependence of the Hc2 anisotropy and large
deviations of the angular dependence of Hc2 from a simple effective-mass law. In the case of field along c-direction we
solved coupled nonlinear Usadel equations numerically to find field evolution of the pair potentials and local densities
of states for two-bands. The existence of two distinct length and field scales corresponding to different bands is
demonstrated.
2004 Elsevier B.V. All rights reserved.
PACS: 74.25.Ha; 74.60.Ec
Keywords: MgB2; Two-band superconductors; Mixed state; Upper critical field

  

Source: Alexei, Koshelev - Materials Science Division, Argonne National Laboratory

 

Collections: Materials Science; Physics