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Effects of Ru substitution on the structural, magnetic and magnetocaloric properties of Pr0.68Ca0.22Sr0.1Mn1−xRuxO3 (x = 0, 0.05, 0.1 and 0.2) compounds

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Abstract

The structural, magnetic and magnetocaloric properties of polycrystalline Pr0.68Ca0.22Sr0.1Mn1−xRuxO3 (x = 0, 0.05, 0.1 and 0.2) compounds were studied. All the samples crystallized in an orthorhombic symmetry. A significant increase in the lattice parameters in the doped samples was attributed to the existence of Ru with a the mixed-valence state (Ru3+/Ru4+). The increase in the Curie temperature (Tc) with increasing Ru content was interpreted as Ru doping promoting the ferromagnetic interactions between Ru4+–Mn3+ and Ru4+–Mn4+pairs. The decrease in saturation magnetisation was attributed to an AFM interaction between the Ru3+–Mn3+ and Ru3+–Mn4+ pairs and smaller magnetic moments of Ru than those of Mn. The decrease in |ΔSM| (from 4.66 J kg−1 K−1 for x = 0.05 to 2.32 J kg−1 K−1 for x = 0.2 at 5 T) was attributed to the nature of phase transition (from a first-order to second-order transition) and a decrease in the saturation magnetisation.

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Acknowledgements

This work was supported by the Inonu University research fund with Project Number 1658.

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Authors and Affiliations

  1. Science and Arts Faculty, Physics Department, Inonu University, 44069, Malatya, Turkey

    M. Pektas, T. Izgi, H. Gencer, S. Atalay, V. S. Kolat & N. Bayri

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  1. M. Pektas
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  2. T. Izgi
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  3. H. Gencer
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  4. S. Atalay
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  5. V. S. Kolat
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Correspondence to T. Izgi.

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Pektas, M., Izgi, T., Gencer, H. et al. Effects of Ru substitution on the structural, magnetic and magnetocaloric properties of Pr0.68Ca0.22Sr0.1Mn1−xRuxO3 (x = 0, 0.05, 0.1 and 0.2) compounds. J Mater Sci: Mater Electron 31, 15731–15741 (2020). https://doi.org/10.1007/s10854-020-04135-7

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