Abstract
Recently, magnetic topological semimetals have received a lot of attention due to their potential applications in spintronics. By using first-principles calculations, we propose that two ferromagnetic spinel materials of X2MnO4 (X = Li, Na) have Weyl-type nodal chains around the Fermi level. Their stability is validated by the cohesive energies, phonon dispersions, and elastic constants. The nodal chains are composed of two kinds of nodal loops that are protected by the glide operation M̃z, the mirror operation M1¯01 and their equivalents. The drumhead surface states are observed on the (001) surface, which exhibits nontrivial topological features. In addition, the compounds’ semimetal states are well preserved under electron correlation and lattice strains. Our work provides two promising candidates for exploring the combination of magnetic materials and topological semimetal states.
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