Critical behavior near the paramagnetic-ferromagnetic phase transition in polycrystalline La0.6Ca0.2Ba0.15□0.05MnO3. Issue 11 (15th August 2016)

• Record Type: Journal Article
• Authors: Sfifir, I.; Nasser, N. Ouled; Khlifa, H. Ben; Cheikhrouhou-Koubaa, W.; Koubaa, M.; Cheikhrouhou, A.
• Is Part Of: Ceramics international. Volume 42:Issue 11(2016)
• Page Start: 12956
• Page End: 12963
• Publication Date: 2016-08-15
• Subjects: Perovskite manganite -- Critical behavior -- Critical exponents -- Phase transition; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.05.068
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this paper, we present a detailed study on the structural and critical behavior around paramagnetic (PM)-ferromagnetic (FM) phase transition in La0.6 Ca0.2 Ba0.15 □0.05 MnO3 (LCBMO). Our powder specimen was synthesized using the conventional solid-state reaction method and was analyzed by X-ray diffraction and magnetic measurements. X-ray diffraction analysis, at room temperature, shows that LCBMO adopts an orthorhombic structure with Pbnm space group. Detailed analyses of magnetic-field dependences of magnetization in the vicinity of the paramagnetic-ferromagnetic transition, M(H, T), reveal that LCBMO undergoes a second-order magnetic phase transition. Critical behavior has been studied through various techniques such as modified Arrott plot (MAP), Kouvel-Fisher method (KF) and critical isotherm (CI) analysis. The estimated Critical exponents are close to those expected for the mean-field model (β=0.5, γ=1 and δ=3). The reliability of the critical exponent values was confirmed by the Widom scaling relation, as well as the universal scaling hypothesis.