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Upper critical field reaches 90 tesla near the Mott transition in fulleride superconductors

Author

Listed:
  • Y. Kasahara

    (Kyoto University)

  • Y. Takeuchi

    (University of Tokyo)

  • R. H. Zadik

    (Durham University)

  • Y. Takabayashi

    (WPI—Advanced Institute for Materials Research, Tohoku University)

  • R. H. Colman

    (Durham University)

  • R. D. McDonald

    (NHMFL, Los Alamos National Laboratory)

  • M. J. Rosseinsky

    (University of Liverpool)

  • K. Prassides

    (WPI—Advanced Institute for Materials Research, Tohoku University
    Japan Science and Technology Agency (JST), ERATO Isobe Degenerate π-Integration Project, Tohoku University)

  • Y. Iwasa

    (University of Tokyo
    RIKEN Center for Emergent Matter Science (CEMS))

Abstract

Controlled access to the border of the Mott insulating state by variation of control parameters offers exotic electronic states such as anomalous and possibly high-transition-temperature (Tc) superconductivity. The alkali-doped fullerides show a transition from a Mott insulator to a superconductor for the first time in three-dimensional materials, but the impact of dimensionality and electron correlation on superconducting properties has remained unclear. Here we show that, near the Mott insulating phase, the upper critical field Hc2 of the fulleride superconductors reaches values as high as ∼90 T—the highest among cubic crystals. This is accompanied by a crossover from weak- to strong-coupling superconductivity and appears upon entering the metallic state with the dynamical Jahn–Teller effect as the Mott transition is approached. These results suggest that the cooperative interplay between molecular electronic structure and strong electron correlations plays a key role in realizing robust superconductivity with high-Tc and high-Hc2.

Suggested Citation

  • Y. Kasahara & Y. Takeuchi & R. H. Zadik & Y. Takabayashi & R. H. Colman & R. D. McDonald & M. J. Rosseinsky & K. Prassides & Y. Iwasa, 2017. "Upper critical field reaches 90 tesla near the Mott transition in fulleride superconductors," Nature Communications, Nature, vol. 8(1), pages 1-6, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14467
    DOI: 10.1038/ncomms14467
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