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Structural and magnetic properties of Ca1-xLaxFe0.5Mn0.5O3-δ (0.05 ≤ x ≤ 0.15) perovskites

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Abstract

In this work, the impact of La doping on structural and magnetic properties of Ca1-xLaxFe0.5Mn0.5O3-δ (0.05 ≤ x ≤ 0.15) elaborated using the solid-state method has been investigated in details by X-ray diffraction and magnetic measurements. Structural analysis showed that all the phases crystallize in the cubic system with a Pm-3m space group. The electron density (ED) study revealed that Mn/Fe-O and Ca/La-O form partial covalent and ionic bonds, respectively, in the unit cell. Importantly, the ED plots show also the formation of an alternate ordered arrangement of oxygen elements and their vacancies. The magnetic study revealed that all our investigated phases exhibit a paramagnetic (PM)-antiferromagnetic (AFM) transition. The decrease in Neel temperature (TN) with increasing x can be explained by the enhancement of ferromagnetic (FM) magnetic interactions due to La doping. Non-null magnetization and the magnetic hysteresis loop at room temperature confirm the presence of weak ferromagnetism in the PM region. These materials also have complex magnetic responses below TN, which are related to the formation of a variety of magnetic exchange interactions within the system, including AFM, FM and ferrimagnetic (FiM) ordering. As a result, exchange coupling between FM/FiM moments and the antiphase boundaries of AFM explains the observed exchange bias in the compounds. Given the practical applications of perovskites, the current observation of the exchange bias effect and ambient temperature ferromagnetism in these materials may be of major technological significance.

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Article Highlights

  • Ca1-xLaxFe0.5Mn0.5O3-δ (x = 0.05, 0.1 and 0.15) ceramics are elaborated.

  • XRD patterns of all compounds are indexed in the Pm-3 m space group.

  • An alternate arrangement of oxygen elements and their vacancies.

  • Magnetic measurements indicate the formation of weak ferromagnetism in the paramagnetic (PM) region in the system.

  • All the samples exhibit PM-AFM phase transition and the Neel temperature (TN) decreases with Ca content.

  • Complex magnetic responses below TN induced the exchange bias.

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Acknowledgements

This paper within the framework of collaboration is supported by the Tunisian Ministry of Higher Education and Scientific Research and the Portuguese Ministry of Science, Technology and Higher Education. The authors acknowledge the i3N (UID/CTM/50025/2020) and CICECO-Aveiro Institute of Materials (UID/CTM/50011/2020), financed by FCT/MEC and FEDER under the PT2020 Partnership Agreement. This work is also funded by national funds (OE), through FCT – Fundação para a Ciência e a Tecnologia, I.P., in the scope of the framework contract foreseen in the numbers 4, 5 and 6 of the article 23, of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19.

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  1. Faculty of Sciences, Sfax University, B. P. 1171-3000, Sfax, Tunisia

    R. Selmi, W. Cherif & F. Khammassi

  2. CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal

    A. R. Sarabando

  3. i3N-Aveiro, Department of Physics, University of Aveiro, 3810-193, Aveiro, Portugal

    N. M. Ferreira

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Selmi, R., Cherif, W., Khammassi, F. et al. Structural and magnetic properties of Ca1-xLaxFe0.5Mn0.5O3-δ (0.05 ≤ x ≤ 0.15) perovskites. Appl. Phys. A 128, 847 (2022). https://doi.org/10.1007/s00339-022-06001-1

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  • DOI: https://doi.org/10.1007/s00339-022-06001-1

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