Abstract
We report inelastic neutron-scattering experiments on single crystals of NdSrMnO with and . The spin-wave dispersion in the charge-, orbital-, and spin-ordered state in NdSrMnO exhibits a strongly anisotropic stiffness. The sign of the anisotropy is characteristic for the site-centered model for charge and orbital ordering in half doped manganites. Within this model, linear spin-wave theory yields a perfect description of the experimental dispersion. In the ferromagnetic metallic state of NdSrMnO with and magnetic excitations exhibit nearly the same magnon dispersion. High intense signals near the zone boundary over a wide energy level overlap with a sharp spin-wave dispersion, which can be described with a Heisenberg model including nearest-neighbor interactions.
5 More- Received 28 July 2011
DOI:https://doi.org/10.1103/PhysRevB.84.094453
©2011 American Physical Society