Phenomenological two-gap model for the specific heat of MgB 2
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- 1 December 2001
- journal article
- Published by IOP Publishing in Europhysics Letters
- Vol. 56 (6), 856-862
- https://doi.org/10.1209/epl/i2001-00598-7
Abstract
We show that the specific heat of the superconductor 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 Tc 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 MgB2 is a volume effect.Keywords
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