Evolution of the low-frequency spin dynamics in ferromagnetic manganites
J. A. Fernandez-Baca, P. Dai, H. Y. Hwang, S-W. Cheong, C. Kloc
Abstract
Elastic and inelastic neutron scattering was used to study two ferromagnetic manganites A1-xBxMnO3 (x ≈ 0.3) with Tc=197.9 K and 300.9 K. The spin dynamical behavior of these is similar at low temperatures, but drastically different at temperatures around Tc. While the formation of spin clusters of size (20 Å) dominates the spin dynamics of the 197.9 K sample close to Tc, the paramagnetic to ferromagnetic transition for the 300.9 K sample is more conventional. These results, combined with seemingly inconsistent earlier reports, reveal clear systematics in the spin dynamics of the manganites.
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