Role of carbon for superconductivity in MgCxNi3 from specific heat
A. Wälte, G. Fuchs, K.-H. Müller, S.-L. Drechsler, K. Nenkov, L. Schultz
DOI 10.1103/PhysRevB.72.100503 · Physical Review B
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Abstract
The influence of carbon deficiency on superconductivity of MgCNi3 is investigated by specific-heat measurements in the normal and superconducting states. In order to perform a detailed analysis of the normal state specific heat, a computer code is developed that allows for an instantaneous estimate of the main features of the lattice dynamics. By analyzing the evolution of the lattice vibrations within the series and simultaneously considering the visible mass enhancement, the loss in the electron-phonon coupling can be attributed to significant changes of the prominent Ni vibrations. The present data well support the recently established picture of strong electron-phonon coupling and ferromagnetic spin fluctuations in this compound.
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 |
| MgC1.60Ni3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.8 | Pressure not reported | unknown |
| MgC1.00Ni3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | onset |
| MgC0.85Ni3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | Pressure not reported | unknown |
| MgC0.75Ni3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | Pressure not reported | unknown |
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