Anisotropy of the upper critical field in superconductors with anisotropic gaps. Anisotropy parameters of MgB2
Abstract
The upper critical field Hc2 is evaluated for weakly-coupled two-band superconductors. By modeling the actual bands and the gap distribution of MgB2 by two Fermi surface spheroids with average parameters of the real material, we show that Hc2,ab/Hc2,c increases with decreasing temperature in agreement with available data.
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