Anisotropic Eliashberg theory for superconductivity in compressed and doped MgB2

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

Research output: Contribution to journalArticle

13 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

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Superconductivity
Energy gap
superconductivity
Doping (additives)
Electrons
Superconducting transition temperature
Specific heat
Electronic structure
Materials properties
Momentum
electrons
transition temperature
specific heat
electronic structure
momentum

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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Anisotropic Eliashberg theory for superconductivity in compressed and doped MgB2. / Choi, Hyoung Joon; Louie, Steven G.; Cohen, Marvin L.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 79, No. 9, 094518, 03.03.2009.

Research output: Contribution to journalArticle

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