Raman scattering from a superconductivity-induced bound state in $MgB_2$

Details Raman scattering from a superconductivity-induced bound state in $MgB_2$ Raman scattering from a superconductivity-induced bound state in $MgB_2$

2003-02-11

arxiv.org/abs/cond-mat/0302215v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, will appear in PRL

Scientific paper

10.1103/PhysRevLett.90.107002

It is shown that the sharp peak in the $E_{2g}$ Raman spectrum of superconducting $MgB_2$ 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.

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