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New Challenges in Superconductivity: Experimental Advances and Emerging Theories pp 249–258Cite as

Phonon Structure in Point-Contact Spectra of MGB2

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Part of the NATO Science Series II: Mathematics, Physics and Chemistry book series (NAII,volume 183)

Abstract

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 above-gap energies. We compare the expressions for the nonlinear conductivity of tunnel, ballistic, and diffusive point-contacts and show that these expression are similar and correspond to the measurements of the phonon structure in the point-contact spectra for the π-band of MgB2.

Keywords

  • MgB2
  • point-contact spectroscopy
  • two-band/gap superconductivity
  • electronphonon interaction

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Author information

Authors and Affiliations

  1. B.I. Verkin Institute for Low Temperature Physicsa and Engineering, National Academy of Sciences, 47 Lenin Ave., 61103, Kharkiv, Ukraine

    I.K. Yanson

Authors
  1. I.K. Yanson
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Editor information

Editors and Affiliations

  1. University of Miami, FL, USA

    J. Ashkenazi , Joshua L. Cohn  & Fulin Zuo ,  & 

  2. Kazan State University, Kazan, Russian Federation

    Mikhail V. Eremin

  3. Freie Universität Berlin, Germany

    Ilya Eremin

  4. Max-Planck-Institute for Solid State Research, Stuttgart, Germany

    Dirk Manske

  5. EPFL, Institute of Physics of Complex Matter, Lausanne, Switzerland

    Davor Pavuna

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Yanson, I. (2005). Phonon Structure in Point-Contact Spectra of MGB2. In: Ashkenazi, J., et al. New Challenges in Superconductivity: Experimental Advances and Emerging Theories. NATO Science Series II: Mathematics, Physics and Chemistry, vol 183. Springer, Dordrecht. https://doi.org/10.1007/1-4020-3085-1_36

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