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Magnetic freeze-out and anomalous Hall effect in ZrTe5

Journal Article · · npj Quantum Materials
 [1];  [2];  [3];  [2];  [1];  [2];  [2];  [4];  [5];  [6];  [6];  [7];  [1]
  1. Centre National de la Recherche Scientifique (CNRS) (France); Sorbonne Univ., Paris (France); Univ. Paris-Saclay, Gif-sur-Yvette (France)
  2. Univ. of Toulouse (France)
  3. Centre National de la Recherche Scientifique (CNRS) (France); Univ. Paris-Saclay, Gif-sur-Yvette (France)
  4. Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
  5. Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States)
  7. University of Fribourg (Switzerland)
The ultra-quantum limit is achieved when a magnetic field confines an electron gas in its lowest spin-polarised Landau level. Here we show that in this limit, electron doped ZrTe5 shows a metal-insulator transition followed by a sign change of the Hall and Seebeck effects at low temperature. We attribute this transition to a magnetic freeze-out of charge carriers on the ionized impurities. The reduction of the charge carrier density gives way to an anomalous Hall response of the spin-polarised electrons. This behavior, at odds with the usual magnetic freeze-out scenario, occurs in this Dirac metal because of its tiny Fermi energy, extremely narrow band gap and a large g-factor. We discuss the different possible sources (intrinsic or extrinsic) for this anomalous Hall contribution.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1845423
Report Number(s):
BNL-222762-2022-JAAM
Journal Information:
npj Quantum Materials, Journal Name: npj Quantum Materials Journal Issue: 1 Vol. 7; ISSN 2397-4648
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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