Abstract
In the present work, we aim to analyze the magnetocaloric and electrical properties of (La0.75Nd0.25)2/3(Ca0.8Sr0.2)1/3MnO3 manganite prepared by solid-state method at high temperature. The experimental results of the magnetization show that the (La0.75Nd0.25)2/3(Ca0.8Sr0.2)1/3MnO3 compound exhibits a paramagnetic–ferromagnetic transition at TC = 240 K. In addition to the experimental study, theoretical approaches are adopted to investigate the magnetocaloric behavior of this sample. The important parameters such as maximum entropy change, full width at half maximum (δTFWHM) and relative cooling power are explained qualitatively. The electrical properties of the studied sample have been investigated by using a complex impedance spectroscopy technique. These electrical measurements reveal that (La0.75Nd0.25)2/3(Ca0.8Sr0.2)1/3MnO3 sample exhibits a metallic behavior at low temperature and insulator one at high temperature. The temperature (TMI) of the metal–insulator transition is found to be about 240 K. The effects of frequency, temperature and composition on permittivity ε′, ε″ and dielectric loss (tanδ) have been also discussed in terms of hopping of charge carriers between Mn3+ and Mn4+ ions.
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This work is supported by: The Tunisian Ministry of Higher Education and Scientific Research. The French Ministry of Higher Education and Scientific Research.
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Chouikhi, S., Khelifi, J., Nasri, M. et al. Modeling of Magnetic, Magnetocaloric Properties and Dielectrical Characterization of (La0.75Nd0.25)2/3(Ca0.8Sr0.2)1/3MnO3 Manganite Oxide. J Low Temp Phys 197, 471–484 (2019). https://doi.org/10.1007/s10909-019-02239-x
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DOI: https://doi.org/10.1007/s10909-019-02239-x