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- Title
Magnetic Phase Transition, Magneto-transport Properties, and Coexistence of Magnetocaloric and Magnetoresitance in (La<sub>0.6</sub>Sr<sub>0.4</sub>MnO<sub>3</sub>)<sub>1−x</sub>(CuO)<sub>x</sub> Composites.
- Authors
Alshehri, Abdullah H.; Nasri, M.; Hcini, Sobhi; Bouazizi, Mohamed Lamjed; Dhahri, E.
- Abstract
In this study, the magneto-caloric and magneto-transport properties of the perovskites manganites composites (x = 0.00, 0.07, and 0.18) synthesized by the solid-state reaction method are reported. X-ray diffraction (XRD) study to confirm the formation of two phases in composites. The Arrott plot analysis and master curve behavior reveal a second-order magnetic phase transition in the composite samples. Indeed, the value of the magnetic entropy (ΔSM) correlates with that predicted by Landau and Hamad models. On the other hand, the resistivity of the composite samples was measured at the applied magnetic fields of 0 T, 2 T, and 5 T. All the specimens undergo a metallic–semiconductor transition at the temperature Tρ. The temperature dependence of resistivity shows that the transport behavior is governed by the grain boundaries. It is suggested that the CuO addition acts as a separation layer between grains. Therefore, around room temperature, the magnetoresistance (MR) enhancement of the composite is caused by the magnetic disorder. The enhanced MR and ∆SM of these composites make them attractive for potential applications.
- Subjects
MAGNETIC transitions; MAGNETIC entropy; COPPER oxide; TRANSITION temperature; MAGNETIC fields; CRYSTAL grain boundaries
- Publication
Journal of Superconductivity & Novel Magnetism, 2023, Vol 36, Issue 1, p275
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-022-06465-5