Advances in point-contact spectroscopy: two-band superconductor MgB2 (Review)
Abstract
Analysis of the point-contact spectroscopy (PCS) data on the dramatic new high-Tc superconductor magnesium diboride MgB2 reveals quite different behavior of two disconnected σ and π 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 σ and three-dimensional π band, establishing the correlation between the gap value and the intensity of the high-Tc driving force—the E2g boron vibrational mode. PCS data on some nonsuperconducting transition-metal diborides are surveyed for comparison.
- Publication:
-
Low Temperature Physics
- Pub Date:
- April 2004
- DOI:
- 10.1063/1.1704612
- arXiv:
- arXiv:cond-mat/0402095
- Bibcode:
- 2004LTP....30..261Y
- Keywords:
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- Condensed Matter - Superconductivity;
- Condensed Matter - Materials Science
- E-Print:
- 17 pages, 30 figs., will be published in Low Temp. Phys. V.30 (2004) N4