Two band/two gap superconductivity in carbon-substituted MgB2 evidenced by point-contact spectroscopy

Details Two band/two gap superconductivity in carbon-substituted MgB2 evidenced by point-contact spectroscopy Two band/two gap superconductivity in carbon-substituted MgB2 evidenced by point-contact spectroscopy

2003-03-31

arxiv.org/abs/cond-mat/0303644v1

Phys. Rev. B 68, 020505 (R) (2003)

Physics

Condensed Matter

Superconductivity

3 eps figs

Scientific paper

10.1103/PhysRevB.68.020505

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 $2\Delta/kT_c \approx$ 1.7 has been systematically observed. This indicates that the two band/two gap superconductivity is still preserved here.

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