Metamagnetic multiband Hall effect in Ising antiferromagnet ErGa2

• 成果类型: Article
• 署名作者: Kurumaji, Takashi; Fang, Shiang; Ye, Linda; Kitou, Shunsuke; Checkelsky, Joseph G.
• 署名单位: Massachusetts Institute of Technology (MIT); Rutgers University System; Rutgers University New Brunswick; University of Tokyo
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-11865
• DOI: 10.1073/pnas.2318411121
• 发表日期: 2024-06-04
• 关键词: electrical-resistivity; magnetic-properties; fermi-surface; exchange interactions; berry phase; magnetoresistance; intermetallics; field

摘要

Frustrated rare - earth - based intermetallics provide a promising platform for emergent magnetotransport properties through exchange coupling between conduction electrons and localized rare - earth magnetic moments. Metamagnetism, the abrupt change of magnetization under an external magnetic field, is a signature of first - order magnetic phase transitions; recently, metamagnetic transitions in frustrated rare earth intermetallics have attracted interest for their accompanying nontrivial spin structures (e.g., skyrmions) and associated nonlinear and topological Hall effects (THE). Here, we present metamagnetism - induced Hall anomalies in single - crystalline ErGa 2 , which recalls features arising from the THE but wherein the strong Ising - type anisotropy of Er moments prohibits noncoplanar spin structures. We show that the observed anomalies are neither due to anomalous Hall effect nor THE; instead, can be accounted for via 4f - 5d interactions which produce a band - dependent mobility modulation. This leads to a pronounced multiband Hall response across the magnetization process-a metamagnetic multiband Hall effect that resembles a topological - Hall - like response but without nontrivial origins. The present findings may be of general relevance in itinerant metamagnetic systems regardless of coplanar/noncoplanar nature of spins and are important for the accurate identification of Hall signals due to emergent magnetic fields.