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Observation of an exotic insulator to insulator transition upon electron doping the Mott insulator CeMnAsO

Author

Listed:
  • E. J. Wildman

    (University of Aberdeen, Meston Walk)

  • G. B. Lawrence

    (University of Aberdeen, Meston Walk)

  • A. Walsh

    (Imperial College London)

  • K. Morita

    (Imperial College London)

  • S. Simpson

    (University of Aberdeen, Meston Walk)

  • C. Ritter

    (Institut Laue Langevin)

  • G. B. G. Stenning

    (Rutherford Appleton Laboratory, Harwell Science and Innovation Campus)

  • A. M. Arevalo-Lopez

    (Université de Lille, CNRS, Centrale Lille, ENSCL, Université d’Artois, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide)

  • A. C. Mclaughlin

    (University of Aberdeen, Meston Walk)

Abstract

A promising route to discover exotic electronic states in correlated electron systems is to vary the hole or electron doping away from a Mott insulating state. Important examples include quantum criticality and high-temperature superconductivity in cuprates. Here, we report the surprising discovery of a quantum insulating state upon electron doping the Mott insulator CeMnAsO, which emerges below a distinct critical transition temperature, TII. The insulator-insulator transition is accompanied by a significant reduction in electron mobility as well as a colossal Seebeck effect and slow dynamics due to decoupling of the electrons from the lattice phonons. The origin of the transition is tentatively interpreted in terms of many-body localization, which has not been observed previously in a solid-state material.

Suggested Citation

  • E. J. Wildman & G. B. Lawrence & A. Walsh & K. Morita & S. Simpson & C. Ritter & G. B. G. Stenning & A. M. Arevalo-Lopez & A. C. Mclaughlin, 2023. "Observation of an exotic insulator to insulator transition upon electron doping the Mott insulator CeMnAsO," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42858-3
    DOI: 10.1038/s41467-023-42858-3
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    References listed on IDEAS

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