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Neutron scattering measurements on a magnetoresistive manganiteLa$_{0.75}$(Ca$_{0.45}$Sr$_{0.55}$)$_{0.25}$MnO$_3$ show that uncorrelateddynamic polaronic lattice distortions are present in both the orthorhombic (O)and rhombohedral (R) paramagnetic phases. The uncorrelated distortions do notexhibit any significant anomaly at the O-to-R transition. Thus, both theparamagnetic phases are inhomogeneous on the nanometer scale, as confirmedfurther by strong damping of the acoustic phonons and by the anomalousDebye-Waller factors in these phases. In contrast, recent x-ray measurementsand our neutron data show that polaronic correlations are present only in the Ophase. In optimally doped manganites, the R phase is metallic, while the Oparamagnetic state is insulating (or semiconducting). These measurementstherefore strongly suggest that the {\it correlated} lattice distortions areprimarily responsible for the insulating character of the paramagnetic state inmagnetoresistive manganites.Comment: 10 pages, 8 figures embedde

Uncorrelated and correlated nanoscale lattice distortions in the paramagnetic phase of magnetoresistive manganites