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Author Tyson, T. A. ♦ Mustre de Leon, J. ♦ Conradson, S. D. ♦ Bishop, A. R. ♦ Neumeier, J. J. ♦ Roeder, H. ♦ Zang, J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ LANTHANUM OXIDES ♦ CRYSTAL STRUCTURE ♦ MANGANESE OXIDES ♦ CALCIUM OXIDES ♦ X-RAY SPECTROSCOPY ♦ PEROVSKITES ♦ DOPED MATERIALS ♦ CALCIUM ADDITIONS ♦ POLARONS ♦ BOND LENGTHS ♦ K ABSORPTION ♦ LATTICE PARAMETERS ♦ EXAFS
Abstract We have found that a significant change in the local structure of La{sub 2/3}Ca{sub 1/3}MnO{sub 3} occurs between 80 K and temperatures above the Curie temperature, {ital T}{sub {ital c}}=270 K. Near-edge x-ray-absorption spectra exhibits changes between 80 K and above {ital T}{sub {ital c}}. X-ray-absorption fine structure reveals differences between the nearest-neighbor Mn-O bond distributions at 80 K and above {ital T}{sub {ital c}}. The single-site distribution at low temperature becomes a complex, multi-site distribution above {ital T}{sub {ital c}}. The observed change is consistent with proposed small polaron related local Jahn-Teller distortions for {ital T}{approx_gt}{ital T}{sub {ital c}}. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-06-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 53
Issue Number 21


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