Electronic structure of a rare Earth based nodal line semimetal candidate LnSbTe

Lanthanide-based LnSbTe materials provide a platform to study the interplay between magnetism, spin–orbit coupling (SOC), and topological states, driven by the presence of rare-earth 4f orbitals and nonsymmorphic crystalline symmetry. These compounds crystallize in a tetragonal structure consisting of a square Sb lattice sandwiched between Ln–Te planes, hosting rich electronic and magnetic behavior. Across the LnSbTe family, angle-resolved photoemission spectroscopy (ARPES) measurements reveal a characteristic diamond-shaped Fermi surface, a topological state located at the X point, and a nodal line along multiple high-symmetry directions. Low-temperature bulk measurements indicate magnetic transitions from paramagnetic to antiferromagnetic order, with transition temperatures varying by lanthanide element. In this study, we present a comparative investigation of several LnSbTe members, combining ARPES, low-temperature transport, and density-functional theory (DFT) calculations to explore the influence of SOC on the electronic band structure and the evolution of magnetic and topological properties within this material family.