Systematic study of two-band/two-gap superconductivity in carbon-substituted MgB2 by point-contact spectroscopy
Z. Hoľanová, P. Szabó, P. Samuely, R. H. T. Wilke, S. L. Bud’ko, P. C. Canfield
DOI 10.1103/PhysRevB.70.064520 · Physical Review B
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Abstract
Point-contact measurements on the carbon-substituted Mg(B1−xCx)2 filament/powder samples directly reveal a retention of the two superconducting energy gaps in the whole doping range from x=0 to x≈0.1. The large gap on the σ-band is decreased in an essentially linear fashion with increasing the carbon concentrations. The changes in the small gap Δπ up to 3.8% C are proportionally smaller and are more difficult to detect but for the heavily doped sample with x≈0.1 and Tc=22K both gaps are still present, and significantly reduced, consistent with a strong essentially linear, reduction of each gap with the transition temperature.
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 | onset |
| Mg(B0.979C0.021)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37.5 | Pressure not reported | onset |
| Mg(B0.962C0.038)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36.2 | 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. | 22 | Pressure not reported | unknown |
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