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Published June 4, 2019 | Published
Journal Article Open

Linear magnetoresistance in the low-field limit in density-wave materials

Abstract

The magnetoresistance (MR) of a material is typically insensitive to reversing the applied field direction and varies quadratically with magnetic field in the low-field limit. Quantum effects, unusual topological band structures, and inhomogeneities that lead to wandering current paths can induce a cross-over from quadratic to linear MR with increasing magnetic field. Here we explore a series of metallic charge- and spin-density-wave systems that exhibit extremely large positive linear MR. By contrast to other linear MR mechanisms, this effect remains robust down to miniscule magnetic fields of tens of Oersted at low temperature. We frame an explanation of this phenomenon in a semiclassical narrative for a broad category of materials with partially gapped Fermi surfaces due to density waves.

Additional Information

© 2019 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND). Edited by Zachary Fisk, University of California, Irvine, CA, and approved March 15, 2019 (received for review November 25, 2018). PNAS first published April 11, 2019. We are grateful to N. Woo and J. Wang for help with the data collection, and to H. Chen for stimulating discussions. Y.F. acknowledges the support from Okinawa Institute of Science and Technology Graduate University with subsidy funding from the Cabinet Office, Government of Japan. The work at California Institute of Technology was supported by National Science Foundation (NSF) Grant DMR-1606858. Work performed at the NHMFL was supported by NSF Cooperative Agreement DMR-1157490 and the State of Florida. J.-Q.Y. was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Division of Materials Sciences and Engineering. Y.Ō. acknowledges Japan Society for the Promotion of Science KAKENHI Grants JP18H043298, JP17K05547, and JP16K05453. B.M. acknowledges support from the NSF through its employee independent research and development program. Author contributions: Y.F. and T.F.R. designed research; Y.F., Y.W., D.M.S., R.K., A.V.S., B.M., and P.B.L. performed research; J.-Q.Y., M.H., T.N., and Y.Ō. contributed new reagents/analytic tools; Y.F., Y.W., D.M.S., and T.F.R. analyzed data; and Y.F., Y.W., D.M.S., and T.F.R. wrote the paper. The authors declare no conflict of interest. This article is a PNAS Direct Submission.

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Created:
August 22, 2023
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October 20, 2023