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

XFe4Ge2 (X = Y, Lu) and Mn3Pt: Filling-enforced magnetic topological metals