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

✍ Scribed by A.A. Golubov; A.E. Koshelev

Publisher: Elsevier Science
Year: 2004
Tongue: English
Weight: 272 KB
Volume: 408-410
Category: Article
ISSN: 0921-4534
DOI: 10.1016/j.physc.2004.02.150

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✦ Synopsis

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 extremely narrow temperature range. This leads to the strong temperature dependence of the H c2 anisotropy and large deviations of the angular dependence of H c2 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.

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