  Nodal line semimetals feature topologically protected band crossings between
the bulk valence and conduction bands that extend along a finite dimension in
the form of a line or a loop. While ZrSiS and similar materials have attracted
extensive research as hosts for the nodal line semimetallic phase, an
alternative avenue has emerged in the form of isostructural rare-earth (RE)
based RESbTe materials. Such systems possess intriguing potentialities for
harboring elements of magnetic ordering and electronic correlations owing to
the presence of 4f electrons intrinsic to the RE elements. In this study, we
have carried out angle resolved photoemission spectroscopy (ARPES) and
thermodynamic measurements in conjunction with first principles computations on
PrSbTe to elucidate its electronic structure and topological characteristics.
Magnetic and thermal characterizations indicate the presence of well-localized
4f states with the absence of any discernible phase transition down to 2 K. The
ARPES results reveal the presence of gapless Dirac crossings that correspond to
a nodal-line along the XR direction in the three-dimensional Brillouin zone.
Furthermore, Dirac crossing that makes up nodal line, which forms a
diamond-shaped nodal plane centered at the center of the Brillouin zone is also
identified within the experimental resolution. This study on the electronic
structure of PrSbTe contributes to the understanding of the pivotal role played
by spin-orbit coupling in the context of the RESbTe family of materials
