Self-Consistent Two-Gap Description of MgB2 Superconductor

Kim, Hyunsoo; Cho, Kyuil; Tanatar, Makariy A.; Taufour, Valentin; Kim, Stella K.; Bud’ko, Sergey L.; Canfield, Paul C.; Kogan, Vladimir G.; Prozorov, Ruslan

doi:10.3390/sym11081012

Title: Self-Consistent Two-Gap Description of MgB2 Superconductor

Journal Article · Tue Aug 06 00:00:00 EDT 2019 · Symmetry

DOI:https://doi.org/10.3390/sym11081012· OSTI ID:1547554

;

; Tanatar, Makariy A.; Taufour, Valentin; Kim, Stella K.; Bud’ko, Sergey L.; Canfield, Paul C.; Kogan, Vladimir G.; Prozorov, Ruslan

A self-consistent two-gap γ -model is used to quantitatively describe several thermodynamic properties of MgB ₂ superconductor. The superconducting coupling matrix, $$ν_{ij}$$, 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.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1547554

Alternate ID(s):: OSTI ID: 1557739

Report Number(s):: IS-J-10005; SYMMAM; PII: sym11081012

Journal Information:: Symmetry, Journal Name: Symmetry Vol. 11 Journal Issue: 8; ISSN 2073-8994

Publisher:: MDPICopyright Statement

Country of Publication:: Switzerland

Language:: English

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Cited by: 3 works

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