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- Title
Effect of Cr Substitution on Magnetic and Magnetocaloric Properties for La<sub>0.62</sub>Nd<sub>0.05</sub>Ba<sub>0.33</sub>MnO<sub>3</sub>.
- Authors
Tillaoui, S.; Ounacer, M.; Essoumhi, A.; Razouk, A.; Hlil, EK.; Sahlaoui, M.; Sajieddine, M.
- Abstract
In this paper, we investigate the structural, magnetic, and magnetocaloric properties of La0.62Nd0.05Ba0.33Mn1-xCrxO3 manganites elaborated by sol gel process. X-ray diffraction analyses confirm that all elaborated samples are crystallized on the rhombohedral perovskite structure with R-3c space group. Magnetic measurements reveal the presence of a magnetic transition from paramagnetic (PM) to ferromagnetic (FM) phase in the vicinity of Curie temperature TC. However, as Cr concentration increases, we witness a decrease in TC from 285 K for x = 0 to 250 K for x = 0.20. This behavior can be explained by the double exchange interaction of Mn3+-O-Mn4+. The maximum entropy change (- Δ S m max ) at µ0H = 5 T is found to be 2.63, 1.88, and 1.76 J.kg−1.K−1 for x = 0, 0.10, and 0.20, respectively. However, our research underlines the enhancement of relative cooling power (RCP) by Cr doping, from 310 to 340 J.kg−1 as Cr concentration increases from x = 0 to 0.20. This finding suggests the usefulness of our samples as magnetic refrigeration material around room temperature. Furthermore, the analysis of the magnetocaloric effect (MCE) using the Landau theory shows a good agreement with the experimental results with a soft difference, indicating the importance of Jahn–Teller interactions on manganites perovskite.
- Subjects
MAGNETIC properties; MAGNETIC cooling; LANDAU theory; MAGNETIC transitions; MAGNETOCALORIC effects; MANGANESE alloys; HEUSLER alloys
- Publication
Journal of Superconductivity & Novel Magnetism, 2022, Vol 35, Issue 6, p1657
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-022-06237-1