Archivio Istituzionale della RicercaWe report the results of the first directional point-contact measurements in MgsB1−xCxd2 single crystals with 0.047<x<0.132. The two-gap superconductivity typical of MgB2 persists up to x=0.105. In this region, the values of the gaps Ds and Dp were determined by fitting the Andreev-reflection conductance curves with a two-band Blonder-Tinkham-Klapwijk sBTKd model, and confirmed by the single-band BTK fit of the s- and p-band conductances, separated by means of a magnetic field. At x=0.132, when Tc=19 K, we clearly observed the merging of the two gaps into one of amplitude D=3 meV.
Evidence for Single-gap Superconductivity in Mg(B1-xCx)2 Single Crystals with x=0.132 from Point-Contact Spectroscopy / Gonnelli, Renato; Daghero, Dario; Calzolari, Andrea; Ummarino, Giovanni; Dellarocca, Valeria; Stepanov, V. A.; Kazakov, S. M.; Zhigadlo, N.; Karpinski, J.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 71:6(2005), pp. 060503(R)-1-060503(R)-4. [10.1103/PhysRevB.71.060503]
Evidence for Single-gap Superconductivity in Mg(B1-xCx)2 Single Crystals with x=0.132 from Point-Contact Spectroscopy
GONNELLI, Renato;DAGHERO, Dario;CALZOLARI, ANDREA;UMMARINO, Giovanni;DELLAROCCA, Valeria;
2005
Abstract
We report the results of the first directional point-contact measurements in MgsB1−xCxd2 single crystals with 0.047
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https://hdl.handle.net/11583/1400923
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