Phenomenological two-gap model for the specific heat of MgB_2

F. Bouquet; Y. Wang; R. A. Fisher; D. G. Hinks; J. D. Jorgensen; A. Junod; N. E. Phillips

doi:10.1209/epl/i2001-00598-7

paper

Phenomenological two-gap model for the specific heat of MgB_2

arXiv:cond-mat/0107196 · doi:10.1209/epl/i2001-00598-7

Abstract

We show that the specific heat of the superconductor MgB_2 (MgB2) 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_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_2 is a volume effect.

7 pages, 4 figures Accepted for publication in Europhysics Letters Text is unchanged. Figure 1 was made clearer (labels). We tried to update cond-mat references from the bibliography which were published (before october 5th)

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