INFRARED RESPONSE OF ORDERED POLARONS IN LAYERED PEROVSKITES

Authors
CALVANI P PAOLONE A DORE P LUPI S MASELLI P MEDAGLIA PG
Citation
P. Calvani et al., INFRARED RESPONSE OF ORDERED POLARONS IN LAYERED PEROVSKITES, Physical review. B, Condensed matter, 54(14), 1996, pp. 9592-9595
Citations number
25
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
54
Issue
14
Year of publication
1996
Pages
9592 - 9595
Database
ISI
SICI code
0163-1829(1996)54:14<9592:IROOPI>2.0.ZU;2-4
Abstract
We report on the infrared absorption spectra of three oxides, were cha rged superlattices have been recently observed in diffraction experime nts. In La1.67Sr0.33NiO4, polaron localization is found to suppress th e low-energy conductivity through the opening of a gap and to split th e E(2u)-A(2u) vibrational manifold of the oxygen octahedra. Similar ef fects are detected in Sr1.5La0.5MnO4 and in La2NiO4+y with peculiar di fferences related to the type of charge ordering.