Large negative magnetoresistance in the antiferromagnet BaMn2Bi2

Takuma Ogasawara, Kim Khuong Huynh, Time Tahara, Takanori Kida, Masayuki Hagiwara, Denis Arčon, Motoi Kimata, Stephane Yu Matsushita, Kazumasa Nagata, Katsumi Tanigaki

Research output: Contribution to journalArticlepeer-review

Abstract

A very large negative magnetoresistance (LNMR) is observed in the insulating regime of the antiferromagnet BaMn2Bi2 when a magnetic field is applied perpendicular to the direction of the sublattice magnetization. A high perpendicular magnetic field eventually suppresses the insulating behavior and allows BaMn2Bi2 to reenter a metallic state. This effect is seemingly unrelated to any field-induced magnetic phase transition, as measurements of magnetic susceptibility and specific heat did not find any anomaly as a function of magnetic fields at temperatures above 2K. The LNMR appears in both current-in-plane and current-out-of-plane settings, and Hall effects suggest that its origin lies in an extreme sensitivity of conduction processes of holelike carriers to the infinitesimal field-induced canting of the sublattice magnetization. The LNMR-induced metallic state may thus be associated with the breaking of the antiferromagnetic parity-time symmetry by perpendicular magnetic fields and/or the intricate multiorbital electronic structure of BaMn2Bi2.

Original languageEnglish
Article number125108
JournalPhysical Review B
Volume103
Issue number12
DOIs
Publication statusPublished - 2021 Mar 4

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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