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  • Open Access

Direct evidence from high-field magnetotransport for a dramatic change of quasiparticle character in van der Waals ferromagnet Fe3−xGeTe2

S. Vaidya1,*, M. J. Coak1,2, D. A. Mayoh1, M. R. Lees1, G. Balakrishnan1, J. Singleton3, and P. A. Goddard1,†

  • 1Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, United Kingdom
  • 2School of Physics & Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
  • 3National High Magnetic Field Laboratory (NHMFL), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

  • *s.vaidya@warwick.ac.uk
  • †p.goddard@warwick.ac.uk
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Phys. Rev. Research 6, L032008 – Published 10 July, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L032008

Abstract

Magnetometry and magnetoresistance (MR) data taken on the van der Waals ferromagnet Fe3−xGeTe2 (FGT) reveal three distinct contributions to the MR: a linear negative component, a contribution from closed Fermi-surface orbits, and an enhancement proportional to the square of the applied magnetic field which is linked to a noncoplanar spin arrangement. Contrary to earlier studies on FGT, by accounting for the field dependence of the anomalous Hall effect, we find that the ordinary Hall coefficient decreases markedly below 80 K, indicating a significant change in character of the electrons and holes on the Fermi-surface at this temperature. The resulting altered ground state eventually causes the Hall coefficient to reverse sign at 35 K. Our Hall data support the proposal that Kondo-lattice behavior develops in this d-electron material below 80 K. Additional evidence comes from the negative linear component of the MR, which arises from electron-magnon scattering with an atypical temperature dependence attributable to the onset of Kondo screening.

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Phys. Rev. Research 6, L032008– Published 10 July, 2024
  • Received 21 December 2023
  • Accepted 15 April 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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