Anomalous Hall effect triggered by pressure-induced magnetic phase transition in α -Mn

Kazuto Akiba, Kaisei Iwamoto, Takaaki Sato, Shingo Araki, Tatsuo C. Kobayashi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Recent interest in topological nature in condensed matter physics has revealed the essential role of Berry curvature in the anomalous Hall effect (AHE). However, since a large Hall response originating from Berry curvature has been reported in quite limited materials, the detailed mechanism remains unclear at present. Here, we report the discovery of a large AHE triggered by a pressure-induced magnetic phase transition in elemental α-Mn. The AHE is absent in the noncollinear antiferromagnetic phase at ambient pressure, whereas a large AHE is observed in the weak ferromagnetic phase under high pressure despite the small magnetization of ≈0.02μB/Mn. Our results indicate that the emergence of the AHE in α-Mn is governed by the symmetry of the underlying magnetic structure, providing a direct evidence of a switch between a zero and nonzero contribution of the Berry curvature across the phase boundary. α-Mn can be an elemental and tunable platform to reveal the role of Berry curvature in AHE.

Original languageEnglish
Article number043090
JournalPhysical Review Research
Volume2
Issue number4
DOIs
Publication statusPublished - Oct 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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