  Magnetism, coupled with nontrivial band topology, can bring about many
interesting and exotic phenomena, so that magnetic topological materials have
attracted persistent research interest. However, compared with non-magnetic
topological materials (TMs), the magnetic TMs are less studied, since their
magnetic structures and topological phase transitions are usually complex and
the first-principles predictions are usually sensitive on the effect of Coulomb
interaction. In this work, we present a comprehensive investigation of XFe4Ge2
(X = Y, Lu) and Mn3Pt, and find these materials to be filling-enforced magnetic
topological metals. Our first-principles calculations show that XFe4Ge2 (X = Y,
Lu) host Dirac points near the Fermi level at high symmetry point S. These
Dirac points are protected by PT symmetry (P and T are inversion and
time-reversal transformations, respectively) and a 2-fold screw rotation
symmetry. Moreover, through breaking PT symmetry, the Dirac points would split
into Weyl nodes. Mn3Pt is found to host 4-fold degenerate band crossings in the
whole high symmetry path of A-Z. We also utilize the GGA+U scheme to take into
account the effect of Coulomb repulsion and find that the filling-enforced
topological properties are naturally insensitive on U.
