# Magnetic Properties and Magnetic Entropy Changes of Eu-Doped La0.9Sr0.1MnO3 Perovskite Manganese Oxides

Authors
• 1 Key Laboratory of Magnetism and Magnetic Materials at Universities of Inner Mongolia Autonomous Region, Baotou Teachers College, Baotou, 014030, China , Baotou (China)
Type
Published Article
Journal
Journal of Low Temperature Physics
Publisher
Springer US
Publication Date
May 14, 2019
Volume
195
Issue
5-6
Pages
403–418
Identifiers
DOI: 10.1007/s10909-019-02171-0
Source
Springer Nature
Keywords
Polycrystalline samples of La0.9−xEuxSr0.1MnO3 (x = 0.00, 0.05) were prepared using the standard solid-state reaction method. The effects of Eu3+ doping on the magnetic properties, magnetic entropy changes, and critical behaviors of La0.9Sr0.1MnO3 polycrystalline samples were systematically investigated. Preformed cluster phases were present in both samples in the temperature ranges of 118–326 K and 121–329 K, respectively. Additionally, near the Curie temperature (TC), the samples exhibited a second-order transition. The critical behaviors of the two samples were best fitted with the mean field model. The maximum magnetic entropy changes ΔSM\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\left| {\Delta S_{\text{M}} } \right|$$\end{document} of the two tested samples at 7 T near TC were 2.76 J K−1 kg−1 and 2.53 J K−1 kg−1, respectively; in addition, their relative cooling power was 425.28 J kg−1 and 354.93 J kg−1, respectively. The maximum magnetic entropy change calculated from the fitted data was in close agreement with the experimental data. These results indicate that the samples have the potential to realize magnetic refrigeration in the high-temperature regime (T > 77 K).