1. Critical behaviour of Pr0.5-xGdxSr0.5MnO3 (0≤x≤0.1) manganite compounds: Correlation between experimental and theoretical considerations
- Author
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W. Boujelben, N. Chniba-Boudjada, M. Bourouina, A. Ben Jazia Kharrat, Matériaux, Rayonnements, Structure (MRS), Institut Néel (NEEL), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])
- Subjects
Materials science ,Condensed matter physics ,02 engineering and technology ,General Chemistry ,Renormalization group ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Manganite ,01 natural sciences ,0104 chemical sciences ,Paramagnetism ,Ferromagnetism ,Phenomenological model ,[CHIM.CRIS]Chemical Sciences/Cristallography ,Curie temperature ,Condensed Matter::Strongly Correlated Electrons ,General Materials Science ,Crystallite ,0210 nano-technology ,Critical exponent ,ComputingMilieux_MISCELLANEOUS - Abstract
In this study, we present an investigation of the critical behaviour of Pr0.5-xGdxSr0.5MnO3 (0 ≤ x ≤ 0.1) polycrystalline compounds synthesized by solid-state reaction method. Magnetic measurements performed around the Curie temperature TC revealed that our compounds exhibit a second order ferromagnetic (FM) to paramagnetic (PM) transition at TC. The obtained critical exponents are found to be close to the mean-field model, suggesting a long-range magnetic interactions for all samples. Then, the substitution of Pr by Gd does not affect the universality class. The phenomenological model proposed by Hamad is used to simulate not only the FM-PM transition, but also the two magnetic transitions present in these structures. Furthermore, thanks to this model, the magnetic entropy change and the relative cooling power can be predicted.
- Published
- 2019
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