Anisotropic Eliashberg theory for superconductivity in compressed and doped MgB2

Hyoung Joon Choi, Steven G. Louie, Marvin L. Cohen

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We have studied superconducting properties of compressed and doped MgB2 by performing first-principles calculations of the normal material properties and by solving the fully anisotropic Eliashberg equations. At each pressure or doping, electronic structures, phonon spectra, and momentum-dependent electron-phonon coupling strengths are calculated. Then using the fully anisotropic Eliashberg equations, the superconducting transition temperatures (Tc), the superconducting energy gaps [Δ (k)], and the specific heats are obtained. Our results show that the multiple-gap nature of Δ (k) in MgB2 is robust with applied pressure although Tc and Δ (k) decrease substantially and that electron doping reduces Tc and degrades severely the superconducting energy gap in the π bands.

Original languageEnglish
Article number094518
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number9
DOIs
Publication statusPublished - 2009 Mar 3

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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