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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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.
Original languageUndefined
Pages (from-to)100501-
JournalPhysical Review B (Condensed Matter and Materials Physics)
Volume69
Issue number10
DOIs
Publication statusPublished - 2004

Keywords

  • METIS-218662
  • IR-47777

Cite this

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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.",
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year = "2004",
doi = "10.1103/PhysRevB.69.100501",
language = "Undefined",
volume = "69",
pages = "100501--",
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Phonon self-energy effects in the superconducting energy gap of MgB2 point-contact spectra. / Yanson, I.K.; Beloborod'ko, S.I.; Naidyuk, Yu G.; Dolgov, O.V.; Golubov, Alexandre Avraamovitch.

In: Physical Review B (Condensed Matter and Materials Physics), Vol. 69, No. 10, 2004, p. 100501-.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Phonon self-energy effects in the superconducting energy gap of MgB2 point-contact spectra

AU - Yanson, I.K.

AU - Beloborod'ko, S.I.

AU - Naidyuk, Yu G.

AU - Dolgov, O.V.

AU - Golubov, Alexandre Avraamovitch

PY - 2004

Y1 - 2004

N2 - 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.

AB - 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.

KW - METIS-218662

KW - IR-47777

U2 - 10.1103/PhysRevB.69.100501

DO - 10.1103/PhysRevB.69.100501

M3 - Article

VL - 69

SP - 100501-

JO - Physical review B: Covering condensed matter and materials physics

JF - Physical review B: Covering condensed matter and materials physics

SN - 2469-9950

IS - 10

ER -