Impact of layer stacking on magnetism in altermagnetic V_1/3NbS₂

Transition metal dichalcogenides host a plethora of interesting electronic phases, including charge density waves, superconductivity, and magnetism. In particular, magnetic intercalants in the van der Waals gap can induce various magnetic orders due to coupling with conduction electrons, including altermagnetic states with spin-split electronic bands despite vanishing net magnetization. Such materials are of great interest for spintronics applications and the harboring of spin for logical bits. Here, we present on the impact of layer stacking in vanadium intercalated niobium disulfide. We use spectroscopic and thermodynamic probes to demonstrate the changes in spin structure between polytypes, but with stable altermagnetic ground states. Lastly, we discuss the extrinsic impact of stacking on intrinsic electronic transport driven from Berry curvature.