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A continuous metal-insulator transition driven by spin correlations

Author

Listed:
  • Yejun Feng

    (Okinawa Institute of Science and Technology Graduate University
    California Institute of Technology)

  • Yishu Wang

    (California Institute of Technology
    The Johns Hopkins University)

  • D. M. Silevitch

    (California Institute of Technology)

  • S. E. Cooper

    (Okinawa Institute of Science and Technology Graduate University)

  • D. Mandrus

    (University of Tennessee
    Materials Science and Technology Division, Oak Ridge National Laboratory)

  • Patrick A. Lee

    (California Institute of Technology
    Department of Physics, Massachusetts Institute of Technology)

  • T. F. Rosenbaum

    (California Institute of Technology)

Abstract

While Mott insulators induced by Coulomb interactions are a well-recognized class of metal-insulator transitions, insulators purely driven by spin correlations are much less common, as the reduced energy scale often invites competition from other degrees of freedom. Here, we demonstrate a clean example of a spin-correlation-driven metal-insulator transition in the all-in-all-out pyrochlore antiferromagnet Cd2Os2O7, where the lattice symmetry is preserved by the antiferromagnetism. After the antisymmetric linear magnetoresistance from conductive, ferromagnetic domain walls is removed experimentally, the bulk Hall coefficient reveals four Fermi surfaces of both electron and hole types, sequentially departing the Fermi level with decreasing temperature below the Néel temperature, TN = 227 K. In Cd2Os2O7, the charge gap of a continuous metal-insulator transition opens only at T ~ 10 K

Suggested Citation

  • Yejun Feng & Yishu Wang & D. M. Silevitch & S. E. Cooper & D. Mandrus & Patrick A. Lee & T. F. Rosenbaum, 2021. "A continuous metal-insulator transition driven by spin correlations," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-23039-6
    DOI: 10.1038/s41467-021-23039-6
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