Anisotropic superconductivity in bulk CaC6
E. Jobiliong, H. D. Zhou, J. A. Janik, Y.-J. Jo, L. Balicas, J. S. Brooks, C. R. Wiebe
DOI 10.1103/PhysRevB.76.052511 · Physical Review B
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Abstract
The intercalated graphite superconductor CaC6 with Tc∼11.5K has been characterized with angular dependent magnetoresistance measurements. Above Tc, the interplane resistivity can be fitted to the Bloch-Grüneisen model providing a Debye temperature of θD=175K. From these parameters, the McMillan formula yields an electron-phonon coupling constant λ∼1.1, placing this material in the intermediate-to-strong coupling regime. For 1.4K<T<Tc, the upper critical field Bc2 is found to be anisotropic and linear in temperature.
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. | 11.5 | Pressure not reported | unknown |
| CaC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12.3 | 1.6 GPa | unknown |
| YbC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
| KC8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.15 | Pressure not reported | unknown |
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