Two-band/two-gap superconductivity in carbon-substituted MgB2 evidenced by point-contact spectroscopy
P. Samuely, Z. Hoľanová, P. Szabó, J. Kačmarčík, R. A. Ribeiro, S. L. Bud’ko, P. C. Canfield
DOI 10.1103/PhysRevB.68.020505 · Physical Review B
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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 2Δ/kTc≈1.7 has been systematically observed. This indicates that the two-band/two-gap superconductivity is still preserved here.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
| Mg(B0.9C0.1)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | onset |
| Mg(B0.9C0.1)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | zero_resistance |
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