Electrical Transport Study of Pressure-Induced Magnetic Transition in YbMnBi2

This study presents high-pressure electrical transport and Raman spectroscopy measurements on the topological semimetal YbMnBi₂. The transport results reveal a significant evolution of the resistance-temperature relationship with increasing pressure, followed by the emergence of negative magnetoresistance above 16.8 GPa and the observation of an anomalous Hall effect with a hysteresis loop at 30.1 GPa. These phenomena, combined with continuous changes in Raman spectra under corresponding pressures, collectively suggest that high pressure induces the formation of a net-moment magnetic ordered state and points to the possibility of a ferromagnetic transition. By systematically analyzing the evolution of resistance-temperature curve shapes, magnetoresistance sign, and Hall behavior, this work elucidates the cooperative regulation of magnetic order and topological electronic states in YbMnBi₂ under pressure, providing new insights for its potential applications in spintronics.