Field Dependence of Electronic Specific Heat in Two-Band Superconductors

Details Field Dependence of Electronic Specific Heat in Two-Band Superconductors Field Dependence of Electronic Specific Heat in Two-Band Superconductors

2001-11-06

arxiv.org/abs/cond-mat/0111088v2

J. Phys. Soc. Jpn. 71, 23 (2002)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures, to be published in J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.71.23

The vortex structure is studied in light of MgB$_2$ theoretically based on a two-band superconducting model by means of Bogoliubov-de Gennes framework. The field dependence of the electronic specific heat coefficient $\gamma (H)$ is focused. The exponent $\alpha$ in $\gamma (H)\propto H^{\alpha}$ is shown to become smaller by adjusting the gap ratio of the two gaps on the major and minor bands. The observed extremely small value $\alpha\sim 0.23$ could be explained reasonably well in this two-band model with the gap ratio $\sim 0.3$.

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