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

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

2004-05-12

arxiv.org/abs/cond-mat/0405246v1

Physics

Condensed Matter

Superconductivity

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

Scientific paper

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$_{2}$.

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