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The Andreev reflection measurements of the superconducting energy gap in thecarbon-substituted MgB$_2$ are presented. Despite the strong suppression of thetransition temperature by 17 K in comparison with the pure MgB$_2$, the samereduced value of the small superconducting energy gap with $2\Delta/kT_c\approx$ 1.7 has been systematically observed. This indicates that the twoband/two gap superconductivity is still preserved here.Comment: 3 eps fig

physical review. b, condensed matter

Two-band/two-gap superconductivity in carbon-substituted<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">MgB</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>evidenced by point-contact spectroscopy

Two-band/two-gap superconductivity in carbon-substitutedMgB2evidenced by point-contact spectroscopy