The disorder-free non-BCS superconductor CS3C60 emerges from an antiferromagnetic insulator parent state

Yasuhiro Takabayashi, Alexey Y. Ganin, Peter Jeglič, Denis Arčon, Takumi Takano, Yoshihiro Iwasa, Yasuo Ohishi, Masaki Takata, Nao Takeshita, Kosmas Prassides, Matthew J. Rosseinsky

Research output: Contribution to journalArticlepeer-review

170 Citations (Scopus)

Abstract

The body-centered cubic A15-structured cesium fulleride Cs 3C60 is not superconducting at ambient pressure and is free from disorder, unlike the well-studied face-centered cubic A 3C60 alkali metal fulleride superconductors. We found that in Cs3C60, where the molecular valences are precisely assigned, the superconducting state at 38 kelvin emerges directly from a localized electron antiferromagnetic insulating state with the application of pressure. This transition maintains the threefold degeneracy of the active orbitals in both competing electronic states; it is thus a purely electronic transition to a superconducting state, with a dependence of the transition temperature on pressure-induced changes of anion packing density that is not explicable by Bardeen-Cooper-Schrieffer (BCS) theory.

Original languageEnglish
Pages (from-to)1585-1590
Number of pages6
JournalScience
Volume323
Issue number5921
DOIs
Publication statusPublished - 2009 Mar 20

ASJC Scopus subject areas

  • General

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