Charge Disproportionation and Ordering in La₁/₃Sr₂/₃FeO₃₋δ
Abstract
The perovskite La1/3Sr2/3FeO3-δ was investigated by neutron diffraction, magnetic and Mössbauer spectroscopy measurements. La1/3Sr2/3FeO3-δ undergoes magnetic ordering at T = 190-200 K accompanied by charge disproportionation. Magnetic peaks due to charge ordering are observed below 200 K. The charge ordering is gradually developed below 200 K along with a charge disproportionation, 2Fe4+ ⇒ Fe3+ + Fe5+. La1/3Sr2/3FeO3-δ shows an antiferromagnetic structure at low temperature. Magnetic moments of about 3 and 1.3 μB were obtained from the neutron diffraction data refinement for Fe3+ and Fe5+ at 15 K, respectively, which suggest that both Fe ions are in a low spin state. These values are significantly lower than those reported by Battle et al for La1/3Sr2/3FeO 2.98. Mössbauer spectra indicate that full charge ordering might be reached below 20 K with no Fe4+.
Recommended Citation
J. Yang and X. Zhou and Z. Chu and W. M. Hikal and Q. Cai and J. C. Ho and D. C. Kundaliya and W. B. Yelon and W. J. James and H. U. Anderson and H. H. Hamdeh and S. K. Malik, "Charge Disproportionation and Ordering in La₁/₃Sr₂/₃FeO₃₋δ," Journal of Physics: Condensed Matter, Institute of Physics - IOP Publishing, Jan 2003.
The definitive version is available at https://doi.org/10.1088/0953-8984/15/29/321
Department(s)
Materials Science and Engineering
Second Department
Physics
Third Department
Chemistry
International Standard Serial Number (ISSN)
0953-8984
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2003 Institute of Physics - IOP Publishing, All rights reserved.
Publication Date
01 Jan 2003
