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The authors show that the specific heat of the superconductor MgBsub 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 Tsub 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 MgBsub 2 is a volume effect.
Bouquet et al. (Sat,) studied this question.