Two band/two gap superconductivity in carbon-substituted MgB2 evidenced by point-contact spectroscopy
P. Samuely, Z. Holanova, P. Szabo, J. Kacmarcik, R. A. Ribeiro, S. L. Bud'ko, P. C. Canfield
Abstract
The Andreev reflection measurements of the superconducting energy gap in the carbon-substituted MgB2 are presented. Despite the strong suppression of the transition temperature by 17 K in comparison with the pure MgB2, the same reduced value of the small superconducting energy gap with 2Δ/kTc ≈ 1.7 has been systematically observed. This indicates that the two band/two gap superconductivity is still preserved here.
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