American Physical Society, Physical Review Letters, 21(83), p. 4393-4396, 1999
DOI: 10.1103/physrevlett.83.4393
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X-ray and neutron scattering measurements directly demonstrate the existence of polarons in the paramagnetic phase of optimally doped colossal magnetoresistive oxides. The polarons exhibit short-range correlations that grow with decreasing temperature, but disappear abruptly at the ferromagnetic transition because of the sudden charge delocalization. The ''melting'' of the charge ordering as we cool through T{sub C} occurs with the collapse of the quasistatic polaron scattering, and provides important new insights into the relation of polarons to colossal magnetoresistance. (c) 1999 The American Physical Society.