It is generally believed that the electrical transport in magnetoresistive manganites above T C is governed by small polarons associated with large lattice distortions. We present evidence which confirms the existence of magnetic clusters (polarons) associated with minimal lattice distortions above the Curie temperature. We take advantage of the fact that the Mössbauer spectra of the relatively large and slowly fluctuating magnetic polarons consist of incompletely collapsed magnetic component with extensive wings.
Physics, Astronomy, and Materials Science
© 2001 American Physical Society
Chechersky, Vladimir, Amar Nath, I. Isaac, Jurgen P. Franck, Kartik Ghosh, and Richard L. Greene. "Absence of small lattice polarons above the Curie temperature in magnetoresistive manganites." Physical Review B 63, no. 5 (2001).
Physical Review B