  The LnSbTe (Ln = Lanthanides) family, like isostructural ZrSiS type
compounds, has emerged as a fertile playground for exploring the interaction of
electronic correlations and magnetic ordering with the nodal line band
topology. Here, we report a detailed electronic band structure investigation of
TbSbTe, corroborated by electrical transport, thermodynamic, and magnetic
studies. Temperature-dependent magnetic susceptibility and thermodynamic
transport studies indicate the onset of antiferromagnetic ordering below TN =
5.1 K. The electronic band structure study, carried out with high-resolution
angle-resolved photoemission spectroscopy (ARPES) measurements aided with
density functional theory based first-principles calculations reveals presence
of nodal lines in the GammaX high symmetry direction, forming a diamond-shaped
nodal plane around Gamma high symmetry point. A strongly photon energy
dependent nodal feature located at the X point of the surface Brillouin zone,
indicating an extended nodal line along X R direction, is also observed. This
study elucidates the intricate interplay among symmetry-protected band
characteristics, the influence of spin orbit coupling, magnetism, and
topological properties.
