期刊
PHYSICAL REVIEW B
卷 84, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.094453
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资金
- Deutsche Forschungsgemeinschaft [Sonderforschungsbereich 608]
- EPSRC [EP/I004831/1]
- EPSRC [EP/I004831/1, EP/I004831/2] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I004831/1, EP/I004831/2] Funding Source: researchfish
We report inelastic neutron-scattering experiments on single crystals of Nd1-xSrxMnO3 with x = 0.5 and x = 0.49. The spin-wave dispersion in the charge-, orbital-, and spin-ordered state in Nd0.5Sr0.5MnO3 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 Nd1-xSrxMnO3 with x = 0.49 and x = 0.50 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.
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