Anisotropic Eliashberg theory for superconductivity in compressed and doped MgB2
Hyoung Joon Choi, Steven G. Louie, Marvin L. Cohen
DOI 10.1103/PhysRevB.79.094518 · Physical Review B
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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(k⃗)], and the specific heats are obtained. Our results show that the multiple-gap nature of Δ(k⃗) in MgB2 is robust with applied pressure although Tc and Δ(k⃗) decrease substantially and that electron doping reduces Tc and degrades severely the superconducting energy gap in the π bands.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure unresolved | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | 30 GPa | unknown |
| Mg0.8Al0.2B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36 | Pressure unresolved | unknown |
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