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Effect of iron do** on magnetic properties of Sr0.78Y0.22CoO2.625+δ-layered perovskite

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Abstract

The Sr0.78Y0.22Co1−x Fe x O2.625+δ (x = 0 and 0.12) system has been studied using neutron diffraction technique, magnetization, and elastic properties measurements. Undoped sample exhibits superstructure with 2√2a p  * 2√2a p  * 4a p metrics and structural phase transition at T = 360 K. Magnetic ordering starts to develop below 360 K. Spontaneous magnetization shows anomalous behavior and reaches maximal value nearly room temperature. A magnetic structure of the both compounds has been described assuming G-type antiferromagnetic ordering. There are two different magnetic moment values for Co ions in CoO6 and CoO4.5 layers. Magnetic moments in CoO4.5 layers are larger than those for octahedrons. The refined values of magnetic moments indicate a mixed low–high spin state of Co3+ for the both layers. There is no evidence for any change of the magnetic structure type with temperature lowering despite the anomalous magnetization behavior. Iron do** (x = 0.12) leads to a suppression of the small ferromagnetic component, disappearance of the 2√2a p  * 2√2a p  * 4a p metrics, and strong increase of the average magnetic moment for Co4.5 layer. It is suggested that the ferromagnetic component in the undoped samples is a result of non-collinearity of the magnetic moments within CoO4.5 layers.

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Acknowledgements

The work was supported partly by Fund for fundamental research of Belarus (project F08R-081) and by the European Commission under the 6th Framework Program through the Key Action: Strengthening the European Research Area, Research Infrastructures. Contract n: RII3-CT-2003-505925 (NMI3). One of the authors (D.V.K.) is grateful to the Foundation for Science and Technology of Portugal (FCT) for financial support (Grant No. SFRH/BPD/42506/2007).

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Authors and Affiliations

  1. Scientific-Practical Materials Research Centre NAS of Belarus, P. Brovka str. 19, 220072, Minsk, Belarus

    I. O. Troyanchuk & D. V. Karpinsky

  2. Technische Universität München, Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Lichtenbergstr. 1, 85748, Garching, Germany

    A. P. Sazonov & A. Senyshyn

  3. Laboratory of Neutron Scattering, ETH Zurich and Paul Scherrer Institute, 5232, Villigen, Switzerland

    V. Sikolenko & V. Efimov

  4. Department of Ceramics and Glass Engineering and CICECO, University of Aveiro, 3810-193, Aveiro, Portugal

    D. V. Karpinsky

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  1. I. O. Troyanchuk
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  3. A. P. Sazonov
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  4. V. Sikolenko
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Correspondence to D. V. Karpinsky.

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Troyanchuk, I.O., Karpinsky, D.V., Sazonov, A.P. et al. Effect of iron do** on magnetic properties of Sr0.78Y0.22CoO2.625+δ-layered perovskite. J Mater Sci 44, 5900–5908 (2009). https://doi.org/10.1007/s10853-009-3835-7

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  • DOI: https://doi.org/10.1007/s10853-009-3835-7

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