Evidence for Altermagnetic Spin-Splitting in a Layered Transition-Metal Dichalcogenide

Altermagnetism is an emerging form of magnetic order that unites the compensated spin arrangement of antiferromagnets with the spin-polarized electronic structure typical of ferromagnets. Layered compounds that host this state offer a promising arena for studying symmetry-driven spin effects and incorporating magnetic functionalities into low-dimensional materials. In this study, we identify an intercalated transition-metal dichalcogenide as a potential layered altermagnet. By combining experimental measurements with first-principles calculations, we investigate its electronic properties and temperature-dependent behavior, uncovering signatures indicative of altermagnetic order. Our findings establish intercalated transition-metal dichalcogenides as a versatile materials platform for realizing and tuning altermagnetism in reduced dimensions.