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The nature of the polarons in the optimally doped colossal magnetoresistive(CMR) materials La0.7Ba0.3MnO3 (LBMO) and La0.7Sr0.3MnO3 (LSMO) is studied byelastic and inelastic neutron scattering. In both materials, dynamic nanoscalepolaron correlations develop abruptly in the ferromagnetic state. However, thepolarons are not able to lock-in to the lattice and order, in contrast to thebehavior of La0.7Ca0.3MnO3. Therefore ferromagnetic order in LBMO and LSMOsurvives their formation, explaining the conventional second order nature ofthe ferromagnetic--paramagnetic transition. Nevertheless, the resultsdemonstrate that the fundamental mechanism of polaron formation is a universalfeature of these ferromagnetic perovskite manganites.

Polaron formation in the optimally doped ferromagnetic manganites La0.7Ba0.3MnO3 and La0.7Ba0.3MnO3