Disorder induced collapse of the electron phonon coupling in MgB${}_2$ observed by Raman Spectroscopy

K. A. Yates, G. Burnell, N. A. Stelmashenko +4

The Raman spectrum of the superconductor MgB${}_2$ has been measured as a function of the Tc of the film. A striking correlation is observed between the $T_c$ onset and the frequ…