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Phenomenological two-gap model for the specific heat of MgB <sub>2</sub>
Europhysics Letters (EPL) · 2001 · Vol. 56(6) · pp. 856–862
F. Bouquet✉(Lawrence Berkeley National Laboratory)Y. Wang(University of Geneva)Robert A. Fisher(Lawrence Berkeley National Laboratory)D. G. Hinks(Argonne National Laboratory)J. D. Jorgensen(Argonne National Laboratory)A. Junod(University of Geneva)N. E. Phillips(University of California, Berkeley)
Abstract
The authors show that the specific heat of the superconductor MgB{sub 2} 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 T{sub c} 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 MgB{sub 2} is a volume effect.
Superconductivity in MgB2 and AlloysPhysics of Superconductivity and MagnetismSuperconducting Materials and ApplicationsSuperconductivityCondensed matter physicsSpecific heatPhenomenological modelBand gapMaterials scienceVolume (thermodynamics)Range (aeronautics)PhysicsThermodynamics
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References
Theory of Superconductivity
Physical Review · 1957 · 12,841 citations
Die thermodynamischen Funktionen des Supraleiters
The European Physical Journal A · 1959 · 835 citations
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