Transition temperatures and vacancies in superconducting Rb3C60

Ashfia Huq; Peter W. Stephens

doi:10.1103/PhysRevB.72.092511

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Transition temperatures and vacancies in superconducting Rb3C60

Ashfia Huq, Peter W. Stephens

DOI 10.1103/PhysRevB.72.092511 · Physical Review B

T1

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Abstract

We have studied the role of alkali-metal vacancies in the structure and superconductivity in nominal Rb3C60 through preparation of samples with different alkali-metal loadings and annealing temperatures, to search for the possible role of nonstoichiometry in superconductivity. We find sample-to-sample variations of ∼1K in the superconducting transition temperature, but this does not correlate with vacancy concentration. We conclude that a model of electronic structure of alkali-metal fullerenes based on proximity to a Mott-Hubbard transition at integer doping is not applicable.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30.37	Pressure not reported	onset
Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	29.79	Pressure not reported	onset
Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30.73	Pressure not reported	onset