Mossbauer spectroscopy as a probe of magnetic states in La(0.5)Ca(0.5)Fe0(3-delta) perovskite

Charge disproportionation in La(0.5)Ca(0.5)Fe0(3-delta) perovskite has been detected by zero-field Mossbauer spectra from 20 K to room temperature. On the basis of the parameters of center shifts and hyperfine fields, Mossbauer spectra identified that the iron ionic states are Fe(3+) and Fe(5+) belo...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2006-11, Vol.306 (1), p.35-39
Main Authors: Liang, Ya-Qiong, Di, Nai-Li, Cheng, Zhao-Hua
Format: Article
Language:English
Online Access:Get full text
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Summary:Charge disproportionation in La(0.5)Ca(0.5)Fe0(3-delta) perovskite has been detected by zero-field Mossbauer spectra from 20 K to room temperature. On the basis of the parameters of center shifts and hyperfine fields, Mossbauer spectra identified that the iron ionic states are Fe(3+) and Fe(5+) below 150K, Fe(3+), Fe(4+) and Fe(5+) in the intermediate temperature region, as well as Fe(3+) and Fe(4+) above 220K. At low temperatures, the system exhibits a cluster-glass-like state resulting from competition between antiferromagnetic interaction of Fe(3+)-Fe(3+) and ferromagnetic interaction of Fe(3+)-Fe(5+).
ISSN:0304-8853
DOI:10.1016/j.jmmm.2006.02.102