Advances in point-contact spectroscopy: two-band superconductor MgB2 (A review)

Details Advances in point-contact spectroscopy: two-band superconductor MgB2 (A review) Advances in point-contact spectroscopy: two-band superconductor MgB2 (A review)

2004-02-06

arxiv.org/abs/cond-mat/0402095v1

Fiz. Nizhk. Temp. V.30, 355 (2004) [Low Temp. Phys. V.30, 261 (2004)]

Physics

Condensed Matter

Superconductivity

17 pages, 30 figs., will be published in Low Temp. Phys. V.30 (2004) N4

Scientific paper

10.1063/1.1704612

Analysis of the point-contact spectroscopy (PCS) data on the new dramatic high-T$_c$ superconductor MgB$_2$ reveals quite different behavior of two disconnected $\sigma$ and $\pi$ electronic bands, deriving from their anisotropy, different dimensionality, and electron-phonon interaction. PCS allows direct registration of both the superconducting gaps and electron-phonon-interaction spectral function of the two-dimensional $\sigma$ and three-dimensional $\pi$ band, establishing correlation between the gap value and intensity of the high-T$_c$ driving force -- the $E_{2g}$ boron vibration mode. PCS data on some nonsuperconducting transition-metal diborides are surveyed for comparison.

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