科研之友
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摘要
We present elastic and inelastic neutron scattering data on LaSrFeO4. We confirm the known magnetic structure with the magnetic moments lying in the tetragonal basal plane, but our macroscopic and neutron diffraction data do not reveal any additional magnetic phase transition connected to a spin reorientation or to a redistribution of two irreducible representations. Our inelastic neutron scattering data reveals the magnon dispersion along the main-symmetry directions [0 xi 0] and [xi -xi 0]. The dispersion can be explained within linear spin-wave theory yielding an antiferromagnetic nearest-neighbor interaction parameter J(1) = 7.4(3) meV and a next-nearest neighbor interaction parameter J(2) = 0.4(3) meV. The dispersion is gapped with the out-of-plane anisotropy gap found at Lambda(out) = 5.26(2) meV, while evidence is present that the in-plane anisotropy gap lies at lower energies, where it cannot be determined due to limited instrument resolution. DOI: 10.1103/PhysRevB.87.054433
- 出版日期2013-2-27
- 单位中国地震局
