Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: POSTER Ia

MA 19.5: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

Coupled spin-charge order in frustrated itinerant triangular magnets — •Sahinur Reja¹, Rajyavardhan Ray², Jeroen van den Brink¹, and Sanjeev Kumar² — ¹IFW Dresden, Dresden, Germany — ²IISER Mohali, India

We uncover four new spin-charge ordered ground states in the strong coupling limit of the Kondo lattice model on triangular geometry. Two of the states at one-third electronic filling (n=1/3) consist of decorated ferromagnetic chains coupled antiferromagnetically with the neighboring chains. The third magnetic ground state is noncollinear, consisting of antiferromagnetic chains separated by a pair of canted ferromagnetic chains. An even more unusual magnetic ground state is discovered at n=2/3. The state is coplanar, similar to the 120^∘ Yafet-Kittel phase. However, unlike the 120^∘ state, it consists of three types of spin triangles repeating over the lattice. These magnetic orders are stabilized by opening a gap in the electronic spectrum: a “band effect”. In addition to the peculiar spin textures, all these phases support modulations in the electronic charge density. In particular the charge disproportionation at n=2/3 is large with an ordering pattern resembling the observed charge ordering in various triangular lattice systems, such as, 2H-AgNiO₂, 3R-AgNiO₂ and Na_xCoO₂.