Abstract
Cold neutron triple-axis measurements have been used to investigate the nature of the long-wavelength spin dynamics in strongly doped La1−xSrxMnO3 single crystals with x=0.2 and 0.3. Both systems behave like isotropic ferromagnets at low T, with a gapless (E0<0.02 meV) quadratic dispersion relation E=E0+Dq2. The values of the spin-wave stiffness constant D are large (DT=0=167 meV Å2 for x=0.2 and DT=0=176 meV Å2 for x=0.3), which directly shows that the electron transfer energy for the d band is large. D exhibits a power law behavior as a function of temperature, and appears to collapse as T→TC. Nevertheless, an anomalously strong quasielastic central component develops and dominates the fluctuation spectrum as T→TC. Bragg scattering indicates that the magnetization near TC exhibits power law behavior, with β≃0.30 for both systems, as expected for a three-dimensional ferromagnet.
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