Quasiclassical theory for thermodynamic properties of the two-band superconductor MgB2 under magnetic fields

Masatoshi Mugikura, Hiroaki Kusunose, Yoshio Kuramoto

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2 Citations (Scopus)


Consistent account is provided of strongly anisotropic properties in thermodynamics of MgB2 under magnetic field H using approximate analytic solution in the quasiclassical formalism. With the strength of the pairing interactions and the Fermi velocities of two bands as fitting parameters, it is possible to reproduce in wide regions of the phase diagram the H- and temperature dependences of relevant quantities such as the zero-energy density of states (ZEDOS), two energy gaps, the specific heat and the H c2 anisotropy. It is demonstrated that the velocity ratio of two bands affects considerably the low-field behavior of the ZEDOS and energy gaps. The ratio also affects the high-temperature behavior of the Hc2 anisotropy. The anisotropy of the coherence length in the σ band depends weakly on H and T, whereas the coherence length in the π band remains isotropic even in the presence of the inter-band coupling.

Original languageEnglish
Pages (from-to)1806-1810
Number of pages5
Journaljournal of the physical society of japan
Issue number6
Publication statusPublished - 2005 Jun


  • MgB
  • Multiband superconductivity
  • Quasiclassical theory
  • Specific heat
  • Upper critical field

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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