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, A. C. Mclaughlin

Research output: Contribution to journalArticlepeer-review

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, T II. 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.

Original languageEnglish
Article number7037
JournalNature Communications
Volume14
Issue number1
DOIs
StatePublished - Dec 2023

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© 2023, The Author(s).

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