Raman scattering from a superconductivity-induced bound state in $Mg{B}_2$

Abstract

It is shown that the sharp peak in the $E_{2g}$ Raman spectrum of superconducting $Mg{B}_2$ is due to a bound state caused by the electron-phonon coupling. Our theory explains why this peak appears only in the spectra with $E_{2g}$ symmetry and only in the $\sigma$ but not $\pi$ bands. The properties of the bound state and the Raman spectrum are investigated, also in the presence of impurity scattering.

4 pages, 4 figures, will appear in PRL

References in corpus (3)

• Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps
• Two-gap superconductivity in MgB${}_2$: clean or dirty?
• The Superconducting Gap in MgB_2: Electronic Raman Scattering Measurements of Single Crystals

Cited by in corpus (4)

• Inelastic Light Scattering From Correlated Electrons
• Electron-phonon coupling and phonon self-energy in MgB${}_2$: do we really understand MgB${}_2$ Raman spectra ?
• Multi-Gap Superconductivity in MgB2: Magneto-Raman Spectroscopy
• Raman scattering near a d-wave Pomeranchuk instability