Effect of pressure on superconducting Ca-intercalated graphite CaC6
J. S. Kim, L. Boeri, R. K. Kremer, F. S. Razavi
DOI 10.1103/PhysRevB.74.214513 · Physical Review B
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Abstract
The effect of pressure on the superconducting transition temperature (Tc) of the Ca-intercalated graphite compound CaC6 has been investigated up to ∼16kbar. Tc is found to increase under pressure with a large relative ratio ΔTc∕Tc of ≈0.4%∕kbar. Using first-principles calculations, we show that the positive effect of pressure on Tc can be explained within the scope of electron-phonon theory due to the presence of a soft phonon branch associated with in-plane vibrations of the Ca atoms. The implications of the present findings for the current debate about the superconducting mechanism in graphite intercalation compounds are discussed.
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. | 11.4 | Pressure unresolved | onset |
| CaC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.4 | Pressure unresolved | unknown |
| CaC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 5 GPa | unknown |
| CaC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 10 GPa | unknown |
| CaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
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