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

E. J. Wildman, G. B. Lawrence, A. Walsh, K. Morita, S. Simpson, C. Ritter, G. B. G. Stenning, A. M. Arevalo-Lopez and A. C. Mclaughlin ()
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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

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-42858-3

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