Two band/two gap superconductivity in carbon-substituted MgB2 evidenced by point-contact spectroscopy
arXiv:cond-mat/0303644 · doi:10.1103/PhysRevB.68.020505
Abstract
The Andreev reflection measurements of the superconducting energy gap in the carbon-substituted MgB$_2$ are presented. Despite the strong suppression of the transition temperature by 17 K in comparison with the pure MgB$_2$, the same reduced value of the small superconducting energy gap with $2Î/kT_c \approx$ 1.7 has been systematically observed. This indicates that the two band/two gap superconductivity is still preserved here.
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