Large Ca isotope effect in the CaC6 superconductor
D. G. Hinks, D. Rosenmann, H. Claus, M. S. Bailey, J. D. Jorgensen
DOI 10.1103/PhysRevB.75.014509 · Physical Review B
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Abstract
We have measured the Ca isotope effect coefficient, α(Ca), in the newly discovered superconductor CaC6 and find a value of 0.53(2). This result shows that the superconductivity is dominated by coupling of the electrons by Ca phonon modes. The C phonons contribute very little, assuming that this material is a conventional electron-phonon coupled superconductor. Thus, in contrast to another layered material MgB2, where high-energy phonons in the B layers are responsible for the superconductivity, in layered CaC6 the phonons responsible for superconductivity are primarily low-energy modes of the intercalated Ca.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.62 | Pressure not reported | onset |
| Li3Ca2C6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.15 | Pressure not reported | onset |
| KC8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.39 | Pressure not reported | unknown |
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