Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 71, Issue 1, Pages 23-26Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.71.23
Keywords
MgB2; two-band superconducting model; two gaps; vortex structure; electronic specific heat coefficient gamma(H); Bogoliubov-de Gennes equations
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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 gamma(H) is focused. The exponent alpha in gamma(H) alphaH(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 similar to 0.23 could be reasonable in this two-band model with the gap ratio similar to0.3.
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