Observation of two time scales in the ferromagnetic manganite La1-xCaxMnO3, x approximate to 0.3

We report new zero-field muon spin relaxation and neutron spin echo measure ments in ferromagnetic (FM) (La,Ca)MnO3 which suggest at least two spatiall y separated regions possessing very different Mn-ion spin dynamics. One reg ion displays diffusive relaxation, "critical slowing down" near T-C and an increasing volume fraction below T-C, suggesting overdamped FM spinwaves be low T-C. The second region possesses more slowly fluctuating spins, a linew idth independent of q, and a decreasing volume fraction below T-C. The esti mated length scale for the inhomogeneity is less than or equal to 30 Angstr om.