Coexistence of large and small polarons in manganites
Strongly Correlated Electrons
2009-10-31 v1 Materials Science
Abstract
The interplay of the electron-phonon interaction and of the double and super exchange magnetic effects is analyzed in the perovskites with . By using an analytical variational scheme that allows to treat the electron-phonon interaction in a fully quantum manner it is shown that in the intermediate electron-phonon coupling regime a charge density instability occurs near the metal-insulator transition, induced by either temperature or hole doping. The system segregates in antiferromagnetic or paramagnetic small polarons and ferromagnetic large polarons domains characterized by different values of the lattice distortions that are satisfactory compared with those experimentally observed.
Keywords
Cite
@article{arxiv.cond-mat/0011156,
title = {Coexistence of large and small polarons in manganites},
author = {V. Cataudella and G. De Filippis and G. Iadonisi},
journal= {arXiv preprint arXiv:cond-mat/0011156},
year = {2009}
}
Comments
10 pages, 2 figures, to appear on Phys. Rev. B