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29 March 2024
 
  » arxiv » cond-mat/0209472

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Independent determination of the two gaps by directional point-contact spectroscopy in MgB_2 single crystals
R.S. Gonnelli ; D. Daghero ; G.A. Ummarino ; V.A. Stepanov ; J. Jun ; S.M. Kazakov ; J. Karpinski ;
Date 19 Sep 2002
Journal Supercond. Sci. Technol. 16, 171 (2003)
Subject Superconductivity | cond-mat.supr-con
AbstractDirectional 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.
Source arXiv, cond-mat/0209472
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