Specific heat of MgB2 in a one- and two-band model from first-principels calculations

Alexandre Avraamovitch Golubov, J. Kortus, O.V. Dolgov, O. Jepsen, Y. Kong, O.K. Andersen, B.J. Gibson, K. Ahn, R.K. Kremer

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Abstract

The heat capacity anomaly at the transition to superconductivity of the layered superconductor MgB2 is compared to first-principles calculations with the Coulomb repulsion, µ*, as the only parameter which is fixed to give the measured Tc. We solve the Eliashberg equations for both an isotropic one-band model and a two-band model with different superconducting gaps on the π-band and σ-band Fermi surfaces. The agreement with experiments is considerably better for the two-band model than for the one-band model.
Original languageUndefined
Pages (from-to)1353-1360
Number of pages8
JournalJournal of physics: Condensed matter
Volume14
Issue number6
DOIs
Publication statusPublished - 2002

Keywords

  • METIS-206850
  • IR-97890

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