Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps.

@article{Liu2001BeyondES,
  title={Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps.},
  author={Amy Y. Liu and Igor I. Mazin and Jens Kortus},
  journal={Physical review letters},
  year={2001},
  volume={87 8},
  pages={087005}
}
Density-functional calculations of the phonon spectrum and electron-phonon coupling in MgB (2) are presented. The E(2g) phonons, which involve in-plane B displacements, couple strongly to the p(x,y) electronic bands. The isotropic electron-phonon coupling constant is calculated to be about 0.8. Allowing for different order parameters in different bands, the superconducting lambda in the clean limit is calculated to be significantly larger. The E(2g) phonons are strongly anharmonic, and the… CONTINUE READING

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