Independent determination of the two gaps by directional point-contact spectroscopy in MgB_2 single crystals

Details Independent determination of the two gaps by directional point-contact spectroscopy in MgB_2 single crystals Independent determination of the two gaps by directional point-contact spectroscopy in MgB_2 single crystals

2002-09-19

arxiv.org/abs/cond-mat/0209472v2

Supercond. Sci. Technol. 16, 171 (2003)

Physics

Condensed Matter

Superconductivity

6 pages, 4 eps figures. References added, abstract rewritten, text slightly changed. Proceedings of the BOROMAG Conference, Ju

Scientific paper

10.1088/0953-2048/16/2/308

Directional point-contact spectroscopy measurements were performed for the first time in state-of-the-art MgB_2 single crystals. The selective suppression of the superconductivity in the "pi" band by means of a suitable magnetic field allowed separating the partial contribution of each band to the total point-contact conductance. By fitting the partial conductance curves sigma_sigma(V) and sigma_pi(V), we got an independent determination of the two gaps, Delta_sigma and Delta_pi, with a strong reduction of the experimental uncertainty. Their temperature dependence was found to agree well with the predictions of the two-band models for MgB_2.

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