A continuous metal-insulator transition driven by spin correlations

Yejun Feng (), Yishu Wang, D. M. Silevitch, S. E. Cooper, D. Mandrus, Patrick A. Lee and T. F. Rosenbaum ()
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Yejun Feng: Okinawa Institute of Science and Technology Graduate University
Yishu Wang: California Institute of Technology
D. M. Silevitch: California Institute of Technology
S. E. Cooper: Okinawa Institute of Science and Technology Graduate University
D. Mandrus: University of Tennessee
Patrick A. Lee: California Institute of Technology
T. F. Rosenbaum: California Institute of Technology

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: 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

Date: 2021
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DOI: 10.1038/s41467-021-23039-6

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