Phonon structure in point-contact spectra of MgB$_2$

I. K. Yanson

Phonon structure in point-contact spectra of MgB$_2$

Superconductivity 2007-05-23 v1 Materials Science

Authors: I. K. Yanson

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 $\pi$ -band of MgB $_{2}$ .

Keywords

MgB2 point-contact spectra phonon structure strong-coupling superconductor self-energy effect nonlinear conductivity pi-band

Cite

@article{arxiv.cond-mat/0405246,
  title  = {Phonon structure in point-contact spectra of MgB$_2$},
  author = {I. K. Yanson},
  journal= {arXiv preprint arXiv:cond-mat/0405246},
  year   = {2007}
}

Comments

6 pages, 6 figures. Proc. NATO Advanced Research Workshop on New Challenges in Superconductivity, January 2004, Miami, USA

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