Electronic structure of a nodal line semimetal candidate*

LnSbTe (Ln = lanthanides) compounds - isostructural to well-known ZrSiS family of nodal line semimetals - offer a rich platform for studying topological features as well as interaction of topology, magnetism, and electronic correlation. We performed systematic magnetic field induced thermal transport, temperature dependent magnetic susceptibility and field dependent magnetization studies of a rare-earth based ternary semimetal at low temperature. All these studies consistently establish the antiferromagnetic transition at 5.8 K. To investigate the electronic structure of the material, angle resolved photoemission spectroscopy (ARPES) and first principles-based calculations were performed.  Multiple nodal lines along Γ−X  and   Γ−M high symmetry directions were observed in photon energy dependent ARPES measurements.  Dirac point at X point is located well below the Fermi level. Our investigation indicates that this system can provide a rich platform to study the interplay of magnetism, topology  and correlation.