Two-band superconductivity in Pb fromab initiocalculations

Floris, A. and Sanna, A. and Massidda, S. and Gross, E. K. U. (2007) Two-band superconductivity in Pb fromab initiocalculations. Physical Review B, 75 (5). ISSN 2469-9950

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Item Type:Article
Item Status:Live Archive

Abstract

We perform first-principles calculations of the band and k-point resolved superconducting gap of Pb in the framework of the density functional theory for superconductors. Without any adjustable parameter or assuption different from s-wave symmetry, we find two different values of the gap on the two sheets of the Fermi surface, which can be related to the different electron-phonon couplings characterizing the electronic states in the corresponding bands. These, in turn, derive from the different orbital character of the electronic states. We also find some intraband gap anisotropy in each Fermi surface sheet. Our calculated gap, critical temperature and total anisotropy of the gap are in good agreement with tunneling experiments. We estimate an ≈8% enhancement of Tc coming from the gap anisotropy. However, the experimentally found T3 temperature dependence of the specific heat cannot be found within our assumed anisotropic s-wave gap symmetry.

Keywords:Superconductors
Subjects:F Physical Sciences > F300 Physics
Divisions:College of Science > School of Mathematics and Physics
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ID Code:22806
Deposited On:02 Jun 2016 12:32

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