Unconventional Anomalous Hall Effect Driven by Self-Intercalation in Covalent 2D Magnet Cr2Te3

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Keke He - , State University of New York (SUNY) at Buffalo (Author)
  • Mengying Bian - , State University of New York (SUNY) at Buffalo , Peking University, Beijing University of Technology (Author)
  • Samuel D. Seddon - , Chair of Experimental Physics / Photophysics (Author)
  • Koushik Jagadish - , University of Southern California (Author)
  • Andrea Mucchietto - , National High Magnetic Field Laboratory Los Almos (Author)
  • He Ren - , University of Waterloo (Author)
  • Erik Kirstein - , National High Magnetic Field Laboratory Los Almos (Author)
  • Reza Asadi - , University of Waterloo (Author)
  • Jaeil Bai - , University of Nebraska Omaha (Author)
  • Chao Yao - , Shanghai Jiao Tong University (Author)
  • Sheng Pan - , Soochow University (Author)
  • Jie Xiang Yu - , Soochow University (Author)
  • Peter Milde - , Chair of Experimental Physics / Photophysics (Author)
  • Chang Huai - , State University of New York (SUNY) at Buffalo (Author)
  • Haolei Hui - , State University of New York (SUNY) at Buffalo (Author)
  • Jiadong Zang - , University of New Hampshire (Author)
  • Renat Sabirianov - , University of Nebraska Omaha (Author)
  • Xuemei M. Cheng - , Bryn Mawr College (Author)
  • Guoxing Miao - , University of Waterloo (Author)
  • Hui Xing - , Shanghai Jiao Tong University (Author)
  • Yu Tsun Shao - , University of Southern California (Author)
  • Scott A. Crooker - , National High Magnetic Field Laboratory Los Almos (Author)
  • Lukas Eng - , Chair of Experimental Physics / Photophysics (Author)
  • Yanglong Hou - , Peking University, Sun Yat-Sen University (Author)
  • Jonathan P. Bird - , State University of New York (SUNY) at Buffalo (Author)
  • Hao Zeng - , State University of New York (SUNY) at Buffalo (Author)

Abstract

Covalent 2D magnets such as Cr2Te3, which feature self-intercalated magnetic cations located between monolayers of transition-metal dichalcogenide material, offer a unique platform for controlling magnetic order and spin texture, enabling new potential applications for spintronic devices. Here, it is demonstrated that the unconventional anomalous Hall effect (AHE) in Cr2Te3, characterized by additional humps and dips near the coercive field in AHE hysteresis, originates from an intrinsic mechanism dictated by the self-intercalation. This mechanism is distinctly different from previously proposed mechanisms such as topological Hall effect, or two-channel AHE arising from spatial inhomogeneities. Crucially, multiple Weyl-like nodes emerge in the electronic band structure due to strong spin-orbit coupling, whose positions relative to the Fermi level is sensitively modulated by the canting angles of the self-intercalated Cr cations. These nodes contribute strongly to the Berry curvature and AHE conductivity. This component competes with the contribution from bands that are less affected by the self-intercalation, resulting in a sign change in AHE with temperature and the emergence of additional humps and dips. The findings provide compelling evidence for the intrinsic origin of the unconventional AHE in Cr2Te3 and further establish self-intercalation as a control knob for engineering AHE in complex magnets.

Details

Original languageEnglish
Article number2407625
JournalAdvanced Science
Volume12
Issue number2
Early online date15 Nov 2024
Publication statusPublished - 13 Jan 2025
Peer-reviewedYes

External IDs

ORCID /0000-0002-2484-4158/work/176339434