Magnetocaloric Effect Simulation in La0.8Na0.2MnO3-Δ Nanopowders

Nawel Khedmi; Nadia Zaidi; Mohamed Hsini

doi:10.5281/zenodo.8002201

Authors

Nawel Khedmi Physics Department, Faculty of Science and Arts –Al-Makwat, Al-Baha University, Al Bahah, Saudi Arabia https://orcid.org/0009-0004-3973-5247
Nadia Zaidi Department of Physics, College of Sciences, Jouf University, Aljouf, Saudi Arabia https://orcid.org/0000-0002-7743-3328
Mohamed Hsini Laboratory of Physical Chemistry of Materials, Faculty of Science of Monastir, Department of Physics, University of Monastir, Monastir 5019, Tunisia. https://orcid.org/0000-0003-4827-3289

DOI:

https://doi.org/10.5281/zenodo.8002201

Keywords:

Critical behavior, Landau model, Magnetizations, Modified Arrott plot, Spontaneous magnetization

Abstract

The critical behavior of La_0.8Na_0.2MnO_3-Δ nanopowders at the paramagnetic to ferromagnetic phase transition is studied. The optimized critical exponents, through an iterative program based on Kouvel–Fisher method, were found to be as: ; . These obtained critical exponents does not match with the conventional universality classes. In addition, these and values are close the ones predicted by the mean-filed theory ( and ). It has been approved that the estimated critical temperature and the critical exponents are unambiguous and intrinsic to the La_0.8Na_0.2MnO_3-Δ nanopowders. Based on the combination of the Landau model and the Arrott–Noakes equation, the isothermal magnetization curves and the magnetocaloric effect have been successfully simulated.

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