Abstract
The critical behavior of La0.6Sr0.4MnO3/x(Sb2O3) (x = 0.07 and x = 0.18) compounds has been studied based on the data of static magnetic measurements in the vicinity of its critical temperature TC. Using various techniques such as modified Arrott plot, Kouvel–Fisher method and critical isotherm analysis, the estimated critical exponents are found to be (β = 0.323, γ = 1.238, δ = 4.862 at TC = 350.719) and (β = 0.321, γ = 1.243, δ = 4.37at TC = 365.054), for x = 0.07 and 0.18, respectively; both close to Ising model values. The reliability of critical exponents values was confirmed by the Widom scaling relation and the universal scaling hypothesis. Based on the Harris criterion, we deduced that the disorder in our case is relevant, which can be the cause of the change in the universality class. To study the influence of critical exponents on magneto-caloric effect, the local exponent n was studied in terms of the field dependence of the magnetic entropy change. From the field dependence of RCP and ΔSM, it was possible to evaluate the critical exponents of the magnetic phase transition. These values are in good agreement with those obtained from the critical exponents using the Kouvel–Fisher plot (K-F).
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This project was supported by the Deanship of Scientific Research at Prince Sattam Bin Abdulaziz University under the research project No 2020/01/16565.
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Nasri, M., Khelifi, J., Alzahrani, B. et al. The Influence of Sb2O3 Phase on Critical Behavior of La0.6Sr0.4MnO3/x(Sb2O3) (x = 0, 0.7 and x = 0.18) Ceramic Composites. J Low Temp Phys 206, 148–165 (2022). https://doi.org/10.1007/s10909-021-02640-5
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DOI: https://doi.org/10.1007/s10909-021-02640-5