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Self-Consistent Two-Gap Description of MgB2 Superconductor

Ames Laboratory, Ames, IA 50011, USA
Department of Physics & Astronomy, Iowa State University, Ames, IA 50011, USA
Author to whom correspondence should be addressed.
Current address: Center for Nanophysics and Advanced Materials, University of Maryland, College Park, MD 20742, USA.
Current address: Department of Physics, University of California Davis, Davis, CA 95616, USA.
Symmetry 2019, 11(8), 1012;
Received: 18 June 2019 / Revised: 14 July 2019 / Accepted: 2 August 2019 / Published: 6 August 2019
(This article belongs to the Special Issue Gap Symmetry and Structure of Superconductors)
A self-consistent two-gap γ -model is used to quantitatively describe several thermodynamic properties of MgB 2 superconductor. The superconducting coupling matrix, ν i j , was obtained from the fitting of the superfluid density in the entire superconducting temperature range. Using this input, temperature-dependent superconducting gaps, specific heat, and upper critical fields were calculated with no adjustable parameters and compared with the experimental data as well as with the first-principles calculations. The observed agreement between fit and data shows that γ -model provides adequate quantitative description of the two-gap superconductivity in MgB 2 and may serve as a relatively simple and versatile self-consistent description of the thermodynamic quantities in multi-gap superconductors. View Full-Text
Keywords: superconducting gap symmetry and structure; penetration depth; band structure of superconductors superconducting gap symmetry and structure; penetration depth; band structure of superconductors
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Kim, H.; Cho, K.; Tanatar, M.A.; Taufour, V.; Kim, S.K.; Bud’ko, S.L.; Canfield, P.C.; Kogan, V.G.; Prozorov, R. Self-Consistent Two-Gap Description of MgB2 Superconductor. Symmetry 2019, 11, 1012.

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