Superconductivity in LixCsC60 fullerides

Mayumi Kosaka; Katsumi Tanigaki; Kosmas Prassides; Serena Margadonna; Alexandros Lappas; Craig M. Brown; Andrew N. Fitch

doi:10.1103/PhysRevB.59.R6628

Superconductivity in LixCsC60 fullerides

Mayumi Kosaka, Katsumi Tanigaki, Kosmas Prassides, Serena Margadonna, Alexandros Lappas, Craig M. Brown, Andrew N. Fitch

DOI 10.1103/PhysRevB.59.R6628 · Physical Review B

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Abstract

Superconductivity lost in Li2CsC60 is recovered when the t1u band is further filled through introduction of additional Li. Superconducting transition temperatures, Tc of 10.5 K and 8 K are observed for Li3CsC60 and Li4CsC60, respectively. The band filling of nonsuperconducting Li2CsC60 is established by Raman spectroscopy to be n=2.5, while that for superconducting Li3CsC60 is around n=3. These results indicate that appearance of superconductivity in alkali fullerides with stoichiometry A3C60 is sensitively controlled by the filling of the t1u band and that n=3 plays an especially important role.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Li3CsC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.5	Pressure not reported	onset
Li4CsC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	Pressure not reported	onset