Abstract
In this paper, we studied in detail the critical behavior of La0.7Ca0.2Ba0.1MnO3 manganite sample synthesized by the solid state reaction. The critical properties near the ferromagnetic–paramagnetic phase transition have been analyzed from the magnetic data, using various techniques such as the modified Arrott plots, the Kouvel fisher method, critical isotherm analysis and the field dependence of magnetocaloric results. Moreover, the validity of the critical exponents using the various methods has been confirmed by the scaling equation of state and all data fall on two distinct branches, one for T < TC and the other for T > TC, indicating that the critical exponents obtained in this work are accurate. The exponents determined in this study have revealed that the β value is in between the theoretically expected values for 3D-Ising and tricritical mean field model. While, the γ value is close to the mean field theory. The third exponent δ was determined independly from the critical isotherms satisfying the Widom scaling relation. Our systematic result reflects the coexistence of a long range and short range ferromagnetic order in our sample. The temperature variation in the effective exponents βeff and γeff resemble with those for disordered ferromagnet around Curie temperature.
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This work has been supported by the Tunisian Ministry of Higher Education, Scientific Research and Information and Communication Technology.
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Ezaami, A., Sellami-Jmal, E., Cheikhrouhou-Koubaa, W. et al. Investigation of the critical properties near room temperature in La0.7Ca0.2Ba0.1MnO3 manganite. J Mater Sci: Mater Electron 28, 6837–6845 (2017). https://doi.org/10.1007/s10854-017-6382-z
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DOI: https://doi.org/10.1007/s10854-017-6382-z