Araújo, José Humberto deSouza Filho, A. G.Faria, J. L. B.Guedes, I.Sasaki, José MarcosFreire, P. T. C.Mendes Filho, J.Xavier Jr, M. M.Cabral, Francisco de Assis OlímpioCosta, J. A. P. daFreire, V. N.2021-12-142021-12-142003-02-19SOUZA FILHO, A. G.; FARIA, J. L. B.; GUEDES, I.; SASAKI, J. M.; FREIRE, P. T. C.; FREIRE, V. N.; MENDES FILHO, J.; XAVIER JUNIOR, M. M.; CABRAL; F. A. O.; ARAÚJO, J. H. de; COSTA, J. A. P. da. Evidence of magnetic polaronic states in La0.70Sr0.30Mn1ÀxFexO3 manganites. Physical Review. B, Condensed Matter and Materials Physics, EUA, v. 67, n.052405, p. 052405, 2003. Disponivel em: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.67.052405 Acesso em: 27 abr 2020.2469-9969 (online), 2469-9950 (print)https://repositorio.ufrn.br/handle/123456789/45360We have performed x-ray, electrical resistivity, and Raman scattering measurements in La0.70Sr0.30Mn12xFexO3 manganites, with x varying from 0 to 0.40. The appearance of new peaks in the Raman spectra as the Fe content increases is attributed to either otherwise forbidden Raman modes that become active due to symmetry breaking effect or to the phonon density of states features, which arise due to a disorder-induced phenomenon. The softening of some phonon modes suggests the evidence of magnetic polaronic states in the insulating paramagnetic phase of these manganites. Our observations are discussed in connection with the x-ray diffraction and electrical resistivity data.Magnetic polaronicManganitesarticle10.1103/PhysRevB.67.052405