Systematic study of the two band/two gap superconductivity in carbon-substituted MgB2 by point-contact spectroscopy

Details Systematic study of the two band/two gap superconductivity in carbon-substituted MgB2 by point-contact spectroscopy Systematic study of the two band/two gap superconductivity in carbon-substituted MgB2 by point-contact spectroscopy

2004-04-05

arxiv.org/abs/cond-mat/0404096v1

PHYSICAL REVIEW B 70, 064520 (2004)

Physics

Condensed Matter

Superconductivity

5 eps figures

Scientific paper

10.1103/PhysRevB.70.064520

Point-contact measurements on the carbon-substituted Mg(B$_{1-x}$C$_x$)$_2$ filament/powder samples directly reveal a retention of the two superconducting energy gaps in the whole doping range from $x = 0$ to $x \approx 0.1$. The large gap on the $\sigma$-band is decreased in an essentially linear fashion with increasing the carbon concentrations. The changes in the the small gap $\Delta_{\pi}$ up to 3.8 % C are proportionally smaller and are more difficult to detect but for the heavily doped sample with $x \approx 0.1$ and $T_c = 22$ K both gaps are still present, and significantly reduced, consistent with a strong essentially linear, reduction of each gap with the transition temperature.

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