Influence of carbon concentration on the superconductivity in MgCxNi3
L. Shan, K. Xia, Z. Y. Liu, H. H. Wen, Z. A. Ren, G. C. Che, Z. X. Zhao
DOI 10.1103/PhysRevB.68.024523 · Physical Review B
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Abstract
The influence of carbon concentration on the superconductivity (SC) in MgCxNi3 has been investigated by measuring the low temperature specific heat combined with first principles electronic structure calculation. It is found that the specific heat coefficient γn=Cen/T of the superconducting sample (x≈1) in normal state is twice that of the non-superconducting one (x≈0.85). The comparison of measured γn and the calculated electronic density of states (DOS) shows that the effective mass renormalization changes remarkably as the carbon concentration changes. The large mass renormalization for the superconducting sample and the low transition temperature Tc(7K) indicate that more than one kind of boson mediated electron-electron interaction exists in MgCxNi3.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgCxNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | unknown |
| MgCxNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | onset |
| MgCxNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | onset |
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