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A continuous metal-insulator transition driven by spin correlations

Feng, Yejun and Wang, Yishu and Silevitch, D. M. and Cooper, S. E. and Mandrus, D. and Lee, Patrick A. and Rosenbaum, T. F. (2020) A continuous metal-insulator transition driven by spin correlations. . (Unpublished)

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Metal-insulator transitions involve a mix of charge, spin, and structural degrees of freedom, and when strongly-correlated, can underlay the emergence of exotic quantum states. Mott insulators induced by the opening of a Coulomb gap are an important and well-recognized class of transitions, but 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 fully preserved by the antiferromagnetism. After the antisymmetric linear magnetoresistance from conductive, ferromagnetic domain walls is carefully removed experimentally, the Hall coefficient of the bulk reveals four Fermi surfaces, two of electron type and two of hole type, sequentially departing the Fermi level with decreasing temperature below the Néel temperature, T_N. Contrary to the common belief of concurrent magnetic and metal-insulator transitions in Cd₂Os₂O₇, the charge gap of a continuous metal-insulator transition opens only at T~10K, well below T_N = 227K. The insulating mechanism resolved by the Hall coefficient parallels the Slater picture, but without a folded Brillouin zone, and contrasts sharply with the behavior of Mott insulators and spin density waves, where the electronic gap opens above and at T_N, respectively.

Item Type:Report or Paper (Discussion Paper)
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URLURL TypeDescription Paper
Feng, Yejun0000-0003-3667-056X
Wang, Yishu0000-0002-5171-8376
Silevitch, D. M.0000-0002-6347-3513
Mandrus, D.0000-0003-3616-7104
Additional Information:Y.F. acknowledges support from the Okinawa Institute of Science and Technology Graduate University, with subsidy funding from the Cabinet Office, Government of Japan. The work at Caltech was supported by National Science Foundation Grant No. DMR-1606858. P.A.L. acknowledges support from the US Department of Energy, Basic Energy Sciences, Grant No. DE-FG02-03ER46076. D.M. acknowledge support from the US Department of Energy, Office of Science, Basic Energy Sciences, Division of Materials Sciences and Engineering. Author contributions: Y.F., Y.W., P.A.L., and T.F.R. conceived of the research; D.M. provided samples; Y.F., Y.W., D.M.S., and S.E.C. performed experiments; Y.F., Y.W., P.A.L., and T.F.R. analyzed data and prepared the manuscript. The authors declare no competing interests.
Funding AgencyGrant Number
Okinawa Institute of Science and TechnologyUNSPECIFIED
Cabinet Office (Japan)UNSPECIFIED
Department of Energy (DOE)DE-FG02-03ER46076
Record Number:CaltechAUTHORS:20201111-082624574
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106607
Deposited By: Tony Diaz
Deposited On:11 Nov 2020 16:47
Last Modified:18 Nov 2020 23:01

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