Mott localization in the correlated superconductor Cs3C 60 resulting from the molecular Jahn-Teller effect

Kamarás, Katalin and Pergerné Klupp, Gyöngyi and Matus, Péter and Ganin, A. Y. and McLennan, A. and Rosseinsky, M. J. and Takabayashi, Y. and McDonald, M. T. and Prassides, K. (2013) Mott localization in the correlated superconductor Cs3C 60 resulting from the molecular Jahn-Teller effect. JOURNAL OF PHYSICS-CONFERENCE SERIES, 428 (1). ISSN 1742-6588

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Abstract

Cs3C60 is a correlated superconductor under pressure, but an insulator under ambient conditions. The mechanism causing this insulating behavior is the combination of Mott localization and the dynamic Jahn-Teller effect. We show evidence from infrared spectroscopy for the dynamic Jahn-Teller distortion. The continuous change with temperature of the splitting of infrared lines is typical Jahn-Teller behavior, reflecting the change in population of solid-state conformers. We conclude that the electronic and magnetic solid-state properties of the insulating state are controlled by molecular phenomena. We estimate the time scale of the dynamic Jahn- Teller effect to be above 10−11 s and the energy difference between the conformers less than 20 cm−1.

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