Phonon self-energy effects in the superconducting energy gap of MgB2 point-contact spectra

I.K. Yanson, S.I. Beloborod'ko, Yu G. Naidyuk, O.V. Dolgov, Alexandre Avraamovitch Golubov

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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 for the nonlinear conductivity of tunnel, ballistic, and diffusive point contacts in the case eV>>Delta, and show that these expressions not only qualitatively, but also semiquantitatively correspond to the measurements of the phonon structure in the point-contact spectra for the pi band of MgB2 thin films.
Original languageUndefined
Pages (from-to)100501-
JournalPhysical Review B (Condensed Matter and Materials Physics)
Issue number10
Publication statusPublished - 2004


  • METIS-218662
  • IR-47777

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