Exotic Magnetotransport in a Heavy Rare-Earth Weyl Semimetal Candidate TbAlGe

Weyl semimetals exhibit a variety of remarkable physical properties, including topologically protected electronic states that coexist with conventional metallic conduction, giving rise to exotic transport phenomena. We report an exotic magnetic phase diagram with multiple field-induced metamagnetic transitions observed in the magnetically ordered state of TbAlGe, which is anisotropic in field orientation, suggesting an important role of anisotropic magnetic interactions in this Weyl semimetal candidate. The first-order magnetostructural transition is evident from the magnetic hysteresis observed both in magnetic and magnetotransport measurements. We investigate the robustness of the Weyl phase across the two magnetic phase transitions, presenting quantum oscillations measurements across the magnetic reorientation to probe whether topological features are resilient to spin reconfiguration.