Self-energy Effect of Superconducting Energy Gap in Point-Contact Spectra of MgB₂
Yanson, I. K. · Beloborod'ko, S. I. · Naidyuk, Yu. G. · Dolgov, O. V. · Golubov, A. A.
Original · EN
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 of the point-contact spectra at the above-gap energies. We derive asymptotic expressions of the phonon structure in MgB%₂ in the case eV≫Δ for tunnel, ballistic, and diffusive point-contacts and show that these expressions not only qualitatively, but also semi-quantitatively correspond to the measurements of the phonon structure in the point-contact spectra for the π-band of MgB₂ c-axis oriented thin films.
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