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Title: Self-Consistent Two-Gap Description of MgB 2 Superconductor

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1];  [2];  [1];  [1];  [1];  [2];  [1]
  1. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
  2. Ames Lab., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1547554
Alternate Identifier(s):
OSTI ID: 1557739
Report Number(s):
IS-J-10005
Journal ID: ISSN 2073-8994; SYMMAM
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Published Article
Journal Name:
Symmetry
Additional Journal Information:
Journal Volume: 11; Journal Issue: 8; Journal ID: ISSN 2073-8994
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; superconducting gap symmetry and structure; penetration depth; band structure of superconductors

Citation Formats

Kim, Hyunsoo, Cho, Kyuil, Tanatar, Makariy A., Taufour, Valentin, Kim, Stella K., Bud’ko, Sergey L., Canfield, Paul C., Kogan, Vladimir G., and Prozorov, Ruslan. Self-Consistent Two-Gap Description of MgB2 Superconductor. United States: N. p., 2019. Web. doi:10.3390/sym11081012.
Kim, Hyunsoo, Cho, Kyuil, Tanatar, Makariy A., Taufour, Valentin, Kim, Stella K., Bud’ko, Sergey L., Canfield, Paul C., Kogan, Vladimir G., & Prozorov, Ruslan. Self-Consistent Two-Gap Description of MgB2 Superconductor. United States. doi:10.3390/sym11081012.
Kim, Hyunsoo, Cho, Kyuil, Tanatar, Makariy A., Taufour, Valentin, Kim, Stella K., Bud’ko, Sergey L., Canfield, Paul C., Kogan, Vladimir G., and Prozorov, Ruslan. Thu . "Self-Consistent Two-Gap Description of MgB2 Superconductor". United States. doi:10.3390/sym11081012.
@article{osti_1547554,
title = {Self-Consistent Two-Gap Description of MgB2 Superconductor},
author = {Kim, Hyunsoo and Cho, Kyuil and Tanatar, Makariy A. and Taufour, Valentin and Kim, Stella K. and Bud’ko, Sergey L. and Canfield, Paul C. and Kogan, Vladimir G. and Prozorov, Ruslan},
abstractNote = {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.},
doi = {10.3390/sym11081012},
journal = {Symmetry},
number = 8,
volume = 11,
place = {United States},
year = {2019},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.3390/sym11081012

Figures / Tables:

Figure 1 Figure 1: (a) Normalized magnetic moment, M(T)/MZFC(5 K), measured after cooling in zero magnetic field to 5 K, applying HDC = 10 Oe and then measuring on warming (zero-field cooling (ZFC)) above Tc and then on cooling (field-cooling (FC)). (b) Magnetization loop, M(H), in MgB2 crystal measured at 5 K.

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.