Anisotropy of the Upper Critical Field in Superconductors with Anisotropic Gaps: Anisotropy Parameters of MgB2

Predrag Miranovic; Kazushige Machida; Vladimir G. Kogan

doi:10.1143/jpsj.72.221

Journal of the Physical Society of Japan

Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015

Anisotropy of the Upper Critical Field in Superconductors with Anisotropic Gaps: Anisotropy Parameters of MgB₂

Predrag Miranovic, Kazushige Machida, Vladimir G. Kogan

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Keywords: Upper critical field, multiband superconductivity

JOURNAL RESTRICTED ACCESS

2003 Volume 72 Issue 2 Pages 221-224

DOI https://doi.org/10.1143/jpsj.72.221

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Abstract

The upper critical field H_c2 is evaluated for weakly-coupled two-band anisotropic 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 H_c2,ab⁄H_c2,c increases with decreasing temperature in agreement with available data.

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