Isovalent Bi³⁺ substitution induced structural and magnetic transitions in LaMnO₃

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• 作者：D. Paul Joseph^a ; J.W. Lin^b ; ^c ; N. Pavan Kumar^a ; W.C. Chen^b ; J.G. Lin^b ; ^{jglin@ntu.edu.tw" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Manganites ; LaMnO3 ; BiMnO3 ; Structural transition ; Magneto-caloric effect
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2016
• 出版时间：15 November 2016
• 年：2016
• 卷：418
• 期：Complete
• 页码：68-75
• 全文大小：2692 K

文摘

Rare earth perovskite manganites have attracted renewed attention due to scientific aspect and prospective device applications. This work explores the structural and magnetic properties of La_(1−x)Bi_xMnO₃ (x=0–0.5) with isovalent Bi³⁺ ions substituted at the La³⁺site synthesized through solid state reaction method. Doping of ‘Bi³⁺’ in LaMnO₃ induces transition from orthorhombic to cubic phase for x≥ 0.3. Decrease in the magnetic transition temperature in ZFC-FC data is correlated to the distortion induced by ‘Bi³⁺’ doping. Spin glass like feature is witnessed in orthorhombic phase and it diminished appreciably for x≥0.3 in the cubic symmetry. At 10 K, coercivity decreases in orthorhombic phase, whereas it increases marginally in cubic phase. Thus, isovalent Bi³⁺ doping in LaMnO₃ is found to induce structural change from orthorhombic to cubic which is also reflected in the magnetic properties as a change over from hard to soft magnetic phase. In addition, a phenomenological model is applied for fitting the field cooled magnetization data. The results of fitting and the related magneto-caloric effect are also discussed in this paper.