Discovery of a new type of magnetic order on pyrochlore spinels

摘要: Frustration in spin system can give rise to unique ordered states and as a consequence several physical phenomena are expected such multiferroics, high temperature superconductors anomalous hall effect. Here we report the "new magnetic orders" induced by anisotropic exchanges on pyrochlore spinels interplay of orbit coupling geometrical frustration. Due complicated superexchange paths B-site spinels, claim that interaction between next-nearest neighbors play an important role. Based systematic studies generic model, argue classical be explored spinel systems; local XY state, all-in all-out Palmer-Chalker state coplanar spiral state. In addition, reveal new types phases with finite ordering wavevectors, labeled 'octagonal (prism)' '(distorted) cubic' states. When prism' is stabilized, non-zero scalar chirality induces alternating net current addition orbital magnetization even Mott insulators. Finally, also discuss relevance 'distorted order compound GeCo2O4.