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Elsevier, Journal of Alloys and Compounds, (648), p. 1043-1050

DOI: 10.1016/j.jallcom.2015.07.074

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Critical behavior near the ferromagnetic–paramagnetic phase transition in Sm0.55−Pr Sr0.45MnO3 compounds (0.3 ≤ x ≤ 0.4)

Journal article published in 2015 by Ali Mleiki ORCID, Safa Othmani, Wissem Cheikhrouhou-Koubaa ORCID, Mohamed Koubaa, Abdelwaheb Cheikhrouhou, E. K. Hlil
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

We present a detailed study of the static magnetization M (H, T) in the vicinity of the ferromagnetic–paramagnetic (FM–PM) phase–transition temperature (TC) in polycrystalline Sm0.55−xPrxSr0.45MnO3 (0.3 ≤ x ≤ 0.4) manganites. The critical exponents β, γ, and δ are determined by using various techniques such as modified Arrott plot, Kouvel–Fisher method and critical isotherm analysis, and are found to be β = 0.255 ± 0.021 and γ = 0.957 ± 0.014 with TC = 226 K for Sm0.25Pr0.3Sr0.45MnO3 and β = 0.324 ± 0.024 and γ = 1.212 ± 0.027 with TC = 254 K for Sm0.15Pr0.4Sr0.45MnO3. A careful analysis of the magnetic data recorded in Sm0.55−xPrxSr0.45MnO3 demonstrates the existence of a tri-critical point that separates discontinuous first-order magnetic transition (FOMT) from continuous second-order magnetic transition (SOMT).