The vortex structure is studied in light of MgB2 theoretically based on a two-band superconducting model by means of Bogoliubov-de Gennes framework. The field dependence of the electronic specific heat coefficient γ(H) is focused. The exponent α in γ(H) ∞ H α 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 α ∼ 0.23 could be reasonable in this two-band model with the gap ratio ∼0.3.
- Bogoliubov-de Gennes equations
- Electronic specific heat coefficient γ(H)
- Two gaps
- Two-band superconducting model
- Vortex structure
ASJC Scopus subject areas
- Physics and Astronomy(all)