SPIN FLUCTUATIONS IN LA2 3CA1/3MNO3 PROBED BY FE-57 AND SN-119 MOSSBAUER-SPECTROSCOPY/

Authors
SIMOPOULOS A KALLIAS G DEVLIN E PANAGIOTOPOULOS I PISSAS M
Citation
A. Simopoulos et al., SPIN FLUCTUATIONS IN LA2 3CA1/3MNO3 PROBED BY FE-57 AND SN-119 MOSSBAUER-SPECTROSCOPY/, Journal of magnetism and magnetic materials, 177, 1998, pp. 860-861
Citations number
6
Categorie Soggetti
Material Science","Physics, Condensed Matter
Journal title
Journal of magnetism and magnetic materials → ACNP
ISSN journal
03048853
Volume
177
Year of publication
1998
Part
2
Pages
860 - 861
Database
ISI
SICI code
0304-8853(1998)177:<860:SFIL3P>2.0.ZU;2-C
Abstract
Spin fluctuations in two samples of the La2/3Ca1/3MnO3 system doped wi th 1% Fe-57 and 5% Sn were studied by Mossbauer spectroscopy. Fe subst itutes for Mn3+ and Sn for Mn4+. A charge redistribution occurs betwee n 4.2 K and T-c. The charge carrier concentration defines magnetic reg ions with different coupling constants which fluctuate with relaxation rates increasing exponentially with temperature. At similar to 0.9T(c ) both probes reveal charge localization which spreads fast in the Mn3 +/Mn4+ lattice as the temperature approaches T-c. (C) 1998 Elsevier Sc ience B.V. All rights reserved.