| Issue |
Europhys. Lett.
Volume 56, Number 6, December 2001
|
|
|---|---|---|
| Page(s) | 856 - 862 | |
| Section | Condensed matter: electronic structure, electrical magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00598-7 | |
| Published online | 01 December 2003 | |
Phenomenological two-gap model for the specific heat of 
1
Département de Physique de la Matière Condensée Université de
Genève, CH-1211 Genève 4, Switzerland
2
Lawrence Berkeley
National Laboratory and Department of Chemistry University of
California, Berkeley, CA 94720, USA
3
Materials Science Division,
Argonne National Laboratory Argonne, IL 60439, USA
Received:
11
July
2001
Accepted:
5
October
2001
We show that the specific heat of the superconductor
in zero field, for which significant non-BCS features have been
reported, can be fitted, essentially within experimental error,
over the entire range of temperature to 
by a
phenomenological two-gap model. The resulting gap parameters
agree with previous determinations from band structure
calculations, and from various spectroscopic experiments. The
determination from specific heat, a bulk property, shows that the
presence of two superconducting gaps in is a volume
effect.
PACS: 74.25.Bt – Thermodynamic properties / 74.20.De – Phenomenological theories (two-fluid, Ginzburg-Landau, etc.) / 74.60.-w – Type-II superconductivity
© EDP Sciences, 2001
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