Self-energy Effect of Superconducting Energy Gap in Point-Contact Spectra of MgB${}_2$

I. K. Yanson, S. I. Beloborod'ko, Yu. G. Naidyuk +2

In strong-coupling superconductors with a short electron mean free path the self-energy effects in the superconducting order parameter play a major role in the phonon manifestation…