@article{6e7611f2af52444da749a5f7958965d8,
title = "Large negative magnetoresistance in the antiferromagnet BaMn2Bi2",
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.",
author = "Takuma Ogasawara and Huynh, {Kim Khuong} and Time Tahara and Takanori Kida and Masayuki Hagiwara and Denis Ar{\v c}on and Motoi Kimata and Matsushita, {Stephane Yu} and Kazumasa Nagata and Katsumi Tanigaki",
note = "Funding Information: We thank K. Ogushi, T. Aoyama, K. Igarashi, H. Watanabe, Y. Yanase, T. Urata, and T. Arima for fruitful discussions. This work was supported by a Grant-in-Aid for Scientific Research on Innovative Areas “J-Physics” (Grant No. 18H04304), and by JSPS KAKENHI (Grants No. 18K13489, No. 18H03883, No. 17H045326, and No. 18H03858). T.O. acknowledges the financial support from the International Joint Graduate Program in Materials Science (GP-MS) of Tohoku University. Experiments under high magnetic fields were done at the High Field Laboratory for Superconducting Materials (HFLSM) in Tohoku University. Pulsed field measurements were carried out at the Center for Advanced High Magnetic Field Science in Osaka University under the Visiting Researcher's Program of the Institute for Solid State Physics, the University of Tokyo. This research was partly made under the financial support by the bilateral country research program of JSPS between AIMR, Tohoku University, and Jozef Stefane Institute, Slovenia. This work was also supported by World Premier International Research Center Initiative (WPI), MEXT, Japan. D.A. acknowledges the financial support of the Slovenian Research Agency through BI-JP/17-19-004 and J1-9145 grants. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",
year = "2021",
month = mar,
day = "4",
doi = "10.1103/PhysRevB.103.125108",
language = "English",
volume = "103",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "12",
}