Directional point-contact spectroscopy of MgB2 single crystals in magnetic fields: two-band superconductivity and critical fieldsстатья
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Аннотация:The 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 gave a very accurate measurement 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. (C) 2004 Elsevier B.V. All rights reserved.