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

Yanson, I.K. and Beloborod'ko, S.I. and Naidyuk, Yu G. and Dolgov, O.V. and Golubov, A.A. (2004) Phonon self-energy effects in the superconducting energy gap of MgB2 point-contact spectra. Physical Review B: Condensed matter and materials physics, 69 (10). p. 100501. ISSN 1098-0121

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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 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.
Item Type:	Article
Copyright:	© 2004 The American Physical Society
Faculty:	Science and Technology (TNW)
Research Group:	Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/47777
Official URL:	http://dx.doi.org/10.1103/PhysRevB.69.100501
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