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While the spin dynamics of La$_{0.7}$Ca$_{0.3}$MnO$_3$ in the ferromagneticphase are known to be unconventional, previous measurements have yieldedcontradictory results regarding the damping of spin wave excitations. Neutronspectroscopy measurements on a sample with a transition temperature of$T_c$=257 K, higher than most single crystals, unambiguously reveal ananomalous increase in spin wave damping for excitations approaching theBrillouin zone boundary along the [$100$] direction that cannot be explained asan artifact due to a noninteracting phonon branch. Spin waves throughout the($HK0$) plane display a common trend where the spin wave damping is dependentupon the excitation energy, increasing for energies above roughly 15 meV andreaching a full width at half maximum of at least 20 meV. The results areconsistent with a model of intrinsic spatial inhomogeneity with phase separatedregions approximately 18 {\AA} in size persisting over a large range oftemperatures below $T_c$.

Spin wave damping arising from phase coexistence below $T_c$ in colossal magnetoresistive La$_{0.7}$Ca$_{0.3}$MnO$_3$