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Boundary Effect and Critical Temperature of Two-Band Superconducting Films: Application to MgB2.
- Source :
-
Journal of Low Temperature Physics . Aug2023, Vol. 212 Issue 3/4, p113-126. 14p. - Publication Year :
- 2023
-
Abstract
- Based on the two-band Bogoliubov–de Gennes theory, we study the boundary effect of an interface between a two-gap superconductor and an insulator (or vacuum). New boundary terms are introduced into the two-band Ginzburg–Landau free energy, which modifies the boundary conditions for the corresponding order parameters of the superconductor. A microscopic analysis of these terms is also given and the characteristic length scale of the boundary effect can be estimated. The theory allows for a simple calculation of the critical temperature suppression with the decrease in film thickness for the typical two-band superconductor magnesium diboride. Our numerical results are in good agreement with the experimental data observed in this material. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222291
- Volume :
- 212
- Issue :
- 3/4
- Database :
- Academic Search Index
- Journal :
- Journal of Low Temperature Physics
- Publication Type :
- Academic Journal
- Accession number :
- 164680564
- Full Text :
- https://doi.org/10.1007/s10909-023-02981-3