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Large anomalous Hall effect and negative magnetoresistance in half-topological semimetals

Journal Article · · Communications Physics
 [1];  [2];  [3];  [4];  [5];  [3];  [6];  [3];  [6];  [2];  [7];  [3]
  1. Pennsylvania State Univ., University Park, PA (United States); Nanjing Normal University, Nanjing (China)
  2. Northeastern Univ., Boston, MA (United States)
  3. Pennsylvania State Univ., University Park, PA (United States)
  4. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Laboratory (MagLab)
  5. Academia Sinica, Taipei (Taiwan)
  6. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States). National High Magnetic Field Laboratory (MagLab)
  7. Tata Inst. of Fundamental Research, Bombay (India)
+ Show Author Affiliations
Proposed mechanisms for large intrinsic anomalous Hall effect (AHE) in magnetic topological semimetals include diverging Berry curvatures of Weyl nodes, anticrossing nodal rings or points of non-trivial bands. Here we demonstrate that a half-topological semimetal (HTS) state near a topological critical point can provide an alternative mechanism for a large AHE via systematic studies on an antiferromagnetic (AFM) half-Heusler compound TbPdBi. We not only observe a large AHE with tanΘH ≈ 2 in its field-driven ferromagnetic (FM) phase, but also find a distinct Hall resistivity peak in its canted AFM phase. Moreover, we observe a large negative magnetoresistance with a value of ~98%. Our in-depth theoretical modelling indicates that these exotic transport properties originate from the HTS state which exhibits Berry curvature cancellation between the trivial spin-up and nontrivial spin-down bands. Our study offers alternative strategies for improved materials design for spintronics and other applications.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2999964
Report Number(s):
LA-UR--23-24754; 10.1038/s42005-023-01469-6; 2399-3650
Journal Information:
Communications Physics, Journal Name: Communications Physics Journal Issue: 1 Vol. 6; ISSN 2399-3650
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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