Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-08-26
Physics
Condensed Matter
Strongly Correlated Electrons
REVTeX, 4 pages, 4 figures, submitted to Phys. Rev. Lett
Scientific paper
We report inelastic neutron scattering results on the spin dynamics in the 50 % hole-doped manganites, Pr{1/2}Sr{1/2}MnO3 and Nd{1/2}Sr{1/2}MnO3. 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.
Kajimoto Ryoichi
Kawano Hideaki
Kuwahara Hideki
Tokura Yasuhiro
Tomioka Yasuhide
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