Paramagnetic Spin Correlations in Colossal Magnetoresistive   La0.7Ca0.3MnO3
  Neutron spectroscopy measurements reveal dynamic spin correlations throughout the Brillouin zone in the colossal magnetoresistive material La0.7Ca0.3MnO3 at 265 K (approximately 1.03 Tc). The long-wavelength behavior is consistent with spin diffusion, yet an additional and unexpected component of the scattering is also observed in low-energy constant-E measurements, which takes the form of ridges of strong quasielastic scattering running along (H 0 0) and equivalent directions. Well-defined Q-space correlations are observed in constant-E scans at energies up to at least 28 meV, suggesting robust short-range spin correlations in the paramagnetic phase. 
Joel S. Helton, Matthew B. Stone, Dmitry A. Shulyatev, Yakov M.   Mukovskii, and Jeffrey W. Lynn
cond-mat.str-el