Abstract
An expression that describes the upper critical magnetic field H c2 and generalizes the Gor’kov relation has been derived for the two-band two-gap superconductor MgB2. The expression relates the upper critical magnetic field H c2 to the residual resistivity and the parameters of the band structure and holds in the range from the clean limit to the dirty limit. The ratios of the relaxation times τπ/τσ and the mean free paths of π- and σ-band electrons for MgB2 samples with a low defect level and Mg(B1 − x C x )2 samples with a partial substitution of carbon for boron are determined from experimental data.
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Original Russian Text © N.P. Shabanova, A.I. Golovashkin, 2009, published in Fizika Tverdogo Tela, 2009, Vol. 51, No. 4, pp. 637–642.
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Shabanova, N.P., Golovashkin, A.I. Interrelation of the critical magnetic field H c2 and the residual resistivity for the two-band superconductor MgB2 . Phys. Solid State 51, 670–677 (2009). https://doi.org/10.1134/S1063783409040039
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DOI: https://doi.org/10.1134/S1063783409040039