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Possible Co3+ Low Spin State in Pr0.5−xSmxCa0.5CoO3−δ Induced by Sm Doping

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Abstract

Cobaltites with the general formula ACoO3 exhibit a wide variety of physical properties. Cobaltite Pr0.5Ca0.5CoO3 exhibits a metal–insulator transition accompanied by a structural shift with a delocalized intermediate spin state (\(t_{2g}^{5} e_{g}^{1}\)) or \(S^{*}\) at high temperature. In this work, Pr0.5−xSmxCa0.5CoO3−δ (x = 0.02, 0.04, 0.06, and 0.08) perovskites were synthesized by the standard solid-state method. Rietveld analysis for experimental X-ray diffraction (XRD) patterns showed that the samples crystallize in an orthorhombic structure with space group Pnma (62). Zero field cooling-field cooling (ZFC–FC) magnetization curves, at a temperature range from 50 to 300 K, show paramagnetic behaviors in each of the Sm doped samples. The analysis of magnetization curves suggests that the samples exhibit a short-range ferromagnetic phase at 50 K and a Co low spin (LS) state in the paramagnetic regime.

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Authors and Affiliations

  1. Grupo Física de Materiales, Escuela de Física, Universidad Pedagógica y Tecnológica de Colombia, Avenida Central del Norte 39-115, Tunja, Boyacá, 150003, Colombia

    I. M. Saavedra Gaona, F. Estepa Morantes, G. I. Supelano, C. A. Parra Vargas & A. J. Barón González

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  1. I. M. Saavedra Gaona
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  2. F. Estepa Morantes
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  3. G. I. Supelano
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  4. C. A. Parra Vargas
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Correspondence to I. M. Saavedra Gaona.

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Gaona, I.M.S., Morantes, F.E., Supelano, G.I. et al. Possible Co3+ Low Spin State in Pr0.5−xSmxCa0.5CoO3−δ Induced by Sm Doping. J Low Temp Phys 203, 319–326 (2021). https://doi.org/10.1007/s10909-021-02587-7

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  • DOI: https://doi.org/10.1007/s10909-021-02587-7

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