Magnetocaloric Effect and Critical Behavior Investigations in La{sub 0.45}Pr{sub 0.2}Sr{sub 0.35}MnO{sub 3} Manganite Oxide

Journal Article · Wed May 15 00:00:00 EDT 2019 · Journal of Superconductivity and Novel Magnetism

DOI:https://doi.org/10.1007/S10948-018-4836-Z· OSTI ID:22921280

Omrani, H.; Cheikhrouhou Koubaa, Wissem; Koubaa, Mohamed; Cheikhrouhou, Abdelwaheb ^[1]

---

1. Sfax Technopark, LT2S Lab, Digital Research Center of Sfax (Tunisia)

Structural, magnetic, and magnetocaloric effect (MCE) properties and the critical behavior of the La{sub 0.45}Pr{sub 0.2}Sr{sub 0.35}MnO{sub 3} sample prepared by the sol–gel method have been investigated. The X-ray diffraction characterization reveals that our sample crystallizes in the orthorhombic structure with Pnma space group. Magnetization versus temperature measurement shows that our compound exhibits a ferromagnetic–paramagnetic transition. The Curie temperature is found to be 348 K. Close to this temperature, the maximum values of the magnetic entropy change (ΔS{sub M}) and the relative cooling power (RCP) are found to be 2.84 J/kg/K and 230 J/K under µ{sub 0}H = 5 T, respectively. The Arrott plots revealed that this compound exhibits a second-order magnetic phase transition at T{sub C}. The critical behavior has been investigated by several techniques which are the modified Arrott plot method, the Kouvel–Fisher method, and the critical isotherm analysis. The obtained critical exponents β, γ, and δ are consistent with those predictions of the mean-field model. Their reliability was confirmed by Widom’s scaling relation, as well as the universal scaling hypothesis.

• OSTI ID: 22921280
• Journal Information: Journal of Superconductivity and Novel Magnetism, Vol. 32, Issue 5; Other Information: Copyright (c) 2019 Springer Science+Business Media, LLC, part of Springer Nature; Country of input: International Atomic Energy Agency (IAEA); ISSN 1557-1939
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALORIMETRY
CURIE POINT
ENTROPY
LANTHANUM COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIZATION
MANGANATES
MEAN-FIELD THEORY
ORTHORHOMBIC LATTICES
PARAMAGNETISM
PHASE TRANSFORMATIONS
PRASEODYMIUM COMPOUNDS
SOL-GEL PROCESS
SPACE GROUPS
STRONTIUM COMPOUNDS
TEMPERATURE MEASUREMENT
X-RAY DIFFRACTION