Two band/two gap superconductivity in carbon-substituted MgB2 evidenced by point-contact spectroscopy
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 2/kTc ≈ 1.7 has been systematically observed. This indicates that the two band/two gap superconductivity is still preserved here.
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