Journal
PHYSICAL REVIEW B
Volume 103, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.125108
Keywords
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Funding
- JSPS KAKENHI [18K13489, 18H03883, 17H045326, 18H03858]
- International Joint Graduate Program in Materials Science (GP-MS) of Tohoku University
- AIMR, Tohoku University
- Jozef Stefane Institute, Slovenia
- World Premier International Research Center Initiative (WPI), MEXT, Japan
- Slovenian Research Agency [BI-JP/17-19-004, J1-9145]
- [18H04304]
- Grants-in-Aid for Scientific Research [18K13489, 18H03883, 18H03858] Funding Source: KAKEN
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A very large negative magnetoresistance is observed in the insulating regime of the antiferromagnet BaMn2Bi2 when a magnetic field is applied perpendicular to the direction of the sublattice magnetization, allowing it to reenter a metallic state. This effect is seemingly unrelated to any field-induced magnetic phase transition, and is associated with the extreme sensitivity of conduction processes of holelike carriers to the infinitesimal field-induced canting of the sublattice magnetization.
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 2 K. 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.
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