Emergence of skyrmions from rich parent phases in the molybdenum nitrides

We report a new family of skyrmion materials originated from the antisymmetric Dzyaloshinskii-Moriya (DM) interactions. Based on the symmetric tensor technique, the molybdenum nitrides with the $\beta $-manganese structure, A2Mo3N with A$=$Fe, Co, Rh, are predicted to support the skymion phase. This predication is directly proved in doped FexCo$_{1-x}$Rh$_{0.5}$Mo$_{3}$N components by high resolution Lorentz transmission electron imaging. Interestingly, the parent compounds Fe2Mo3N, Co2Mo3N, and Rh2Mo3N exhibit ferromagnetic, anti-ferromagnetic, and even superconducting orderings respectively. Magnetism in these parent phases is theoretically clarified by the first principle calculations, where the corrected nature of the magnetism is revealed..