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

Katalin Kamarás, Gyöngyi Klupp, Péter Matus, Alexey Y. Ganin, Alec McLennan, Matthew J. Rosseinsky, Yasuhiro Takabayashi, Martin T. McDonald, Kosmas Prassides

Research output: Contribution to journalConference articlepeer-review

11 Citations (Scopus)


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.

Original languageEnglish
Article number012002
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2013
Event21st International Symposium on the Jahn-Teller Effect 2012 - Tsukuba, Japan
Duration: 2012 Aug 262012 Aug 31

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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