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06 August 2020
 
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Directional point-contact spectroscopy of MgB2 single crystals in magnetic fields: two-band superconductivity and critical fields
R.S. Gonnelli ; D. Daghero ; G.A. Ummarino ; Valeria Dellarocca ; A. Calzolari ; V.A. Stepanov ; J. Jun ; S.M. Kazakov ; J. Karpinski ;
Date 23 May 2003
Journal Physica C 408-410, 796 (2004)
Subject Superconductivity | cond-mat.supr-con
AbstractThe results of the first directional point-contact measurements in MgB2 single crystals, in the presence of magnetic fields up to 9 T either parallel or perpendicular to the ab planes, are presented. By applying suitable magnetic fields, we separated the partial contributions of the sigma and pi bands to the total Andreev-reflection conductance. Their fit with the BTK model allowed a very accurate determination of the temperature dependency of the gaps (Delta_sigma and Delta_pi), that resulted in close agreement with the predictions of the two-band models for MgB2. We also obtained, for the first time with point-contact spectroscopy, the temperature dependence of the (anisotropic) upper critical field of the sigma band and of the (isotropic) upper critical field of the pi band.
Source arXiv, cond-mat/0305560
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