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Cascade of magnetic phase transitions and large topological Hall effect in the noncentrosymmetric antiferromagnet
Phys. Rev. Research 7, 043092 – Published 23 October, 2025
DOI: https://doi.org/10.1103/593c-xp66
Abstract
The interplay between symmetry breaking, spin-orbit coupling, and magnetic frustration in noncentrosymmetric antiferromagnets has emerged as a fertile ground for discovering intertwined topological and quantum phenomena. Here, we report a cascade of magnetic phase transitions and a large topological Hall response in the newly discovered noncentrosymmetric antiferromagnetic (AFM) material with a Neél temperature . Under magnetic fields () parallel to the axis, two successive phase transitions at critical fields and are observed in magnetization at temperatures below , which are attributed to the occurrences of sequential field-induced spin states. A pronounced topological Hall effect signal emerges exclusively within an intermediate field window , signifying the formation of topological spin textures. The field-temperature phase diagram mapped via specific heat and magnetoelectric transport measurements incorporates five phase regimes: The paramagnetic state, a high-field polarized state, and three AFM states with distinct spin configurations. Our results identify as a good candidate for scrutinizing sophisticated interplays between magnetic structure and nontrivial band topology.
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