Abstract
The results of the first directional point-contact measurements in MgB 2 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 σ and π bands to the total Andreev-reflection conductance. Their fit with the BTK model gave a very accurate measurement of the temperature dependency of the gaps ( Δ σ and Δ π), that resulted in close agreement with the predictions of the two-band models for MgB 2. We also obtained, for the first time with point-contact spectroscopy, the temperature dependence of the (anisotropic) upper critical field of the σ band.
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