Magnetization and Heat Capacity of R1/3Sr2/3FeO3-δ (R = La and Pr)

Author

V. P.S. Awana
M. Karppinen
H. Yamauchi
S. K. Malik
William B. Yelon, Missouri University of Science and TechnologyFollow
Apurva Mehta
A. V. Narlikar

Abstract

Results of magnetization and heat capacity (CP) measurements are presented for R₁/₃Sr₂/₃FeO_3-δ compounds with R = La and Pr. The change in entropy (ΔS) near the magnetic transition amounts to only 15% of the theoretically expected value for the Fe³⁺ or Fe⁵⁺ spins magnetic ordering. The lower value of ΔS is explained on the basis of reported Mössbauer studies, which revealed a substantial amount of nonmagnetic Fe⁴⁺ in the compound across the magnetic transition. The C_P peak height across the magnetic transition increases substantially after annealing the samples in flowing oxygen. The symmetry in the C_P transitions points toward a structural phase transition coupled with magnetic ordering. The magnitude of ΔS near the magnetic transition in these compounds depends on the synthesis procedure.

Recommended Citation

V. P. Awana et al., "Magnetization and Heat Capacity of R1/3Sr2/3FeO3-δ (R = La and Pr)," IEEE Transactions on Magnetics, vol. 37, no. 4 I, pp. 2163 - 2165, Institute of Electrical and Electronics Engineers, Jan 2001.

The definitive version is available at https://doi.org/10.1109/20.951112

Department(s)

Physics

Comments

University of Missouri, Grant P-00128

Keywords and Phrases

Heat capacity; Magnetic ordering; Single Fe perovskites

International Standard Serial Number (ISSN)

0018-9464

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Institute of Electrical and Electronics Engineers, All rights reserved.

Publication Date

01 Jan 2001