1998/08/26 by H. Kawano, Kawano, H., R. Kajimoto +9
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/9808286
REVTeX, 4 pages, 4 figures, submitted to Phys. Rev. Lett
arxiv created 1998/08/26 · arxiv updated 2009/11/30
We report inelastic neutron scattering results on the spin dynamics in the 50 % hole-doped manganites, Pr1/2Sr1/2MnO3 and Nd1/2Sr1/2MnO3. In the paramagnetic phase, these systems exhibit a ridge-type diffuse scattering, indicating a two-dimensional ferromagnetic (FM) correlation. With decreasing temperature, the systems enter the FM state, but simultaneously they develop A-type antiferromagnetic spin fluctuations. The spin wave dispersion in the FM state is strongly anisotropic. These behaviors can be consistently interpreted from a viewpoint of the underlying orbital ordering.