EVIDENCE FOR A LOCAL LATTICE DISTORTION IN CA-DOPED LAMNO3

Citation
Ta. Tyson et al., EVIDENCE FOR A LOCAL LATTICE DISTORTION IN CA-DOPED LAMNO3, Physical review. B, Condensed matter, 53(21), 1996, pp. 13985-13988
Citations number
32
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
0163-1829
Volume
53
Issue
21
Year of publication
1996
Pages
13985 - 13988
Database
ISI
SICI code
0163-1829(1996)53:21<13985:EFALLD>2.0.ZU;2-G
Abstract
We have found that a significant change in the local structure of La2/ 3Ca1/3MnO3 occurs between 80 K and temperatures above the Curie temper ature, T-c=270 K. Near-edge x-ray-absorption spectra exhibits changes between 80 K and above T-c. X-ray-absorption fine structure reveals di fferences between the nearest-neighbor Mn-O bond distributions at 80 K and above T-c. The single-site distribution at low temperature become s a complex, multi-site distribution above T-c. The observed change is consistent with proposed small polaron related local Jahn-Teller dist ortions for T>T-c.