Phenomenological two-gap model for the specific heat of MgB_2

Details Phenomenological two-gap model for the specific heat of MgB_2 Phenomenological two-gap model for the specific heat of MgB_2

2001-07-10

arxiv.org/abs/cond-mat/0107196v2

Europhysics Letters 56, 856 (2001)

Physics

Condensed Matter

Superconductivity

7 pages, 4 figures Accepted for publication in Europhysics Letters Text is unchanged. Figure 1 was made clearer (labels). We t

Scientific paper

10.1209/epl/i2001-00598-7

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.

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