Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Negative Magnetic Entropy Change and Critical Behavior of Manganite La0.8Sr0.2Mn1−x Co x O3 (x = 0, 0.2)

Negative Magnetic Entropy Change and Critical Behavior of Manganite La0.8Sr0.2Mn1−x Co x O3 (x =... La0.8Sr0.2Mn1−x Co x O3 (x = 0, 0.2) polycrystalline samples were prepared by solid-state reaction, and their structural, Griffiths phase, magnetic entropy change, critical behavior, and electrical transport properties were systematically investigated. The results show that all polycrystalline samples are rhombohedral symmetry structures; the Griffiths phase exists above the low-temperature magnetic transition temperature (T C2) of the two samples; the magnetic field is applied to the La0.8Sr0.2Mn1−x Co x O3 (x = 0, 0.2) samples. The maximum magnetic entropy change ΔS max for 7 T is − 2.28 and − 2.36 J/(kg K), respectively. The doping of Co makes ΔS max increase, and an obvious negative entropy change occurs at low temperature and low field; the critical behavior of La0.8Sr0.2MnO3 (LSMO) fits best with the mean field model, and the critical behavior of the sample after doping with the 3D Heisenberg model fits best; LSMO is a semiconductor material, and the metal insulator transition appears near the low-temperature magnetic transition temperature (T C2) when the Co element doping amount reaches 0.2. The conductivity of the two samples in the high-temperature region satisfies the small polaron model. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Low Temperature Physics Springer Journals

Negative Magnetic Entropy Change and Critical Behavior of Manganite La0.8Sr0.2Mn1−x Co x O3 (x = 0, 0.2)

Download PDF
15 pages

Loading next page...
 
/lp/springer-journals/negative-magnetic-entropy-change-and-critical-behavior-of-manganite-7N7JcfdaG5

References (2)

Publisher
Springer Journals
Copyright
Copyright © 2019 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Physics; Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials
ISSN
0022-2291
eISSN
1573-7357
DOI
10.1007/s10909-018-02138-7
Publisher site
See Article on Publisher Site

Abstract

La0.8Sr0.2Mn1−x Co x O3 (x = 0, 0.2) polycrystalline samples were prepared by solid-state reaction, and their structural, Griffiths phase, magnetic entropy change, critical behavior, and electrical transport properties were systematically investigated. The results show that all polycrystalline samples are rhombohedral symmetry structures; the Griffiths phase exists above the low-temperature magnetic transition temperature (T C2) of the two samples; the magnetic field is applied to the La0.8Sr0.2Mn1−x Co x O3 (x = 0, 0.2) samples. The maximum magnetic entropy change ΔS max for 7 T is − 2.28 and − 2.36 J/(kg K), respectively. The doping of Co makes ΔS max increase, and an obvious negative entropy change occurs at low temperature and low field; the critical behavior of La0.8Sr0.2MnO3 (LSMO) fits best with the mean field model, and the critical behavior of the sample after doping with the 3D Heisenberg model fits best; LSMO is a semiconductor material, and the metal insulator transition appears near the low-temperature magnetic transition temperature (T C2) when the Co element doping amount reaches 0.2. The conductivity of the two samples in the high-temperature region satisfies the small polaron model.

Journal

Journal of Low Temperature Physics – Springer Journals

Published: Feb 28, 2019

There are no references for this article.