  We investigate the low-temperature thermoelectric properties of
three-dimensional nodal-line semimetals within the semiclassical Boltzmann
formalism. Considering short-range interaction between electrons and scattering
agents, we calculate the anisotropic relaxation times and then obtain the
charge conductivity and thermopower along the radial and the axial directions
with respect to the nodal-line plane. Increasing the carrier concentration, a
topological transition in the shape of the Fermi surface from a torus into an
ellipsoid signal as a sharp change in the thermopower. An adequate treatment of
the energy and direction dependence of the relaxation time is necessary for the
observation of the topological transition of the Fermi surface in the
thermoelectric properties.
