Superconducting energy gaps, low temperature specific heat, and quasiparticle spectra of MgB2

Details Superconducting energy gaps, low temperature specific heat, and quasiparticle spectra of MgB2 Superconducting energy gaps, low temperature specific heat, and quasiparticle spectra of MgB2

2001-11-09

arxiv.org/abs/cond-mat/0111183v1

Physics

Condensed Matter

Superconductivity

13 pages, 4 figures

Scientific paper

We report first-principles calculations of the k- and T-dependent superconducting gap Delta(k,T) in MgB2 and its manifestation in various measured quantities. Because the Fermi surface has disconnected sheets with different electron-phonon coupling strengths, our calculations show that near T=0, the values of Delta(k) cluster into two groups: large values (about 6.5 to 7.5 meV) on the strongly coupled sheets and small values (about 1 to 3 meV) on the weakly coupled sheets. The calculated gap, quasiparticle density of states, and specific heat and their temperature dependences are in agreement with the recent measurements which conclude that MgB2 is a multiple gap superconductor. In fact, theory predicts four prominent values for the gap at low T.

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