Superconductivity in graphite intercalation compounds

R. A. Jishi; M. S. Dresselhaus

doi:10.1103/PhysRevB.45.12465

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Superconductivity in graphite intercalation compounds

R. A. Jishi, M. S. Dresselhaus

DOI 10.1103/PhysRevB.45.12465 · Physical Review B

T1

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Abstract

Alkali-metal graphite intercalation compounds undergo a normal-to-superconducting transition at a critical temperature Tc that increases with increasing alkali-metal concentration. Furthermore, the temperature dependence of the critical magnetic field Hc2 is linear down to very low temperatures. A two-band model, which considers coupling between a three-dimensional band and an almost two-dimensional electronic energy band, and which was successfully applied to explain superconductivity in C8K, is used to interpret recently reported data. In particular, we show that the increase in Tc as the alkali-metal concentration increases, the linear temperature dependence of Hc2, and the anisotropy in its value, are consistent with the two-band model.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
C8K Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
C6K Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
C3K Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
C4Na Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.8	Pressure not reported	unknown
C3Na Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.5	Pressure not reported	unknown
C2Na Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5	Pressure not reported	unknown
C2Li Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown