Thickness dependent magnetotransport properties of epitaxial rare-earth silver antimonide thin films

Square net materials are a diverse platform which can host many quantum ground states. We have stabilized two square net systems, LaAgSb₂ and CeAgSb₂, as thin films on atomically flat MgO (110) and Al₂O₃ (11-20) grown by molecular beam epitaxy. In LaAgSb₂, we study how the magnetotransport properties evolve with thickness and how the charge density wave transition temperature differs from bulk. We also find that Kohler’s rule does not provide an apt description of the behavior of the film at low temperature. In CeAgSb₂, we observe how the Neel temperature and anomalous Hall behavior changes with varying thickness. These platforms demonstrate how dimensionality affects the Fermi surface of these quasi-2D systems.