Unconventional high-Tc superconductivity in fullerides

Yasuhiro Takabayashi, Kosmas Prassides

Research output: Contribution to journalReview articlepeer-review

21 Citations (Scopus)

Abstract

A3C60 molecular superconductors share a common electronic phase diagram with unconventional hightemperature superconductors such as the cuprates: superconductivity emerges from an antiferromagnetic strongly correlated Mott-insulating state upon tuning a parameter such as pressure (bandwidth control) accompanied by a dome-shaped dependence of the critical temperature, Tc. However, unlike atombased superconductors, the parent state from which superconductivity emerges solely by changing an electronic parameter-the overlap between the outer wave functions of the constituent molecules-is controlled by the C60 3- molecular electronic structure via the on-molecule Jahn-Teller effect influence of molecular geometry and spin state. Destruction of the parent Mott-Jahn-Teller state through chemical or physical pressurization yields an unconventional Jahn-Teller metal, where quasilocalized and itinerant electron behaviours coexist. Localized features gradually disappear with lattice contraction and conventional Fermi liquid behaviour is recovered. The nature of the underlying (correlated versus weak-coupling Bardeen-Cooper-Schrieffer theory) s-wave superconducting states mirrors the unconventional/conventional metal dichotomy: the highest superconducting critical temperature occurs at the crossover between Jahn-Teller and Fermi liquid metal when the Jahn-Teller distortion melts. This article is part of the themed issue Fullerenes: past, present and future, celebrating the 30th anniversary of Buckminster Fullerene.

Original languageEnglish
Article number20150320
JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume374
Issue number2076
DOIs
Publication statusPublished - 2016 Sep 13

Keywords

  • Antiferromagnetism
  • Electron correlation
  • Fullerenes
  • Jahn-Teller effect
  • Mott insulator
  • Superconductivity

ASJC Scopus subject areas

  • Mathematics(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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