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Above room temperature magnetic entropy in non-stoichiometric manganese of La0.67Sr0.33MnO3 manganites

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Abstract

With an aim to improve the magnetocaloric effect above the room temperature for practical applications, La0.67Sr0.33MnO3 manganite with different manganese concentrations has been synthesized using a novel technique with oxalic acid as a fuel material. The X-ray photoelectron spectroscopy studies confirm the presence of mixed valence states of Mn3+ and Mn4+ with varying manganese content. Studies of the magnetic properties reveal that the samples undergo ferromagnetic to paramagnetic transitions well above room temperatures, i.e., around 383 K. The second order of magnetic phase transition has been confirmed from Arrott plots. The entropy change (ΔSM) over a wide temperature range was observed around magnetic transition temperature in all the samples which can be considered as a suitable material for magnetic refrigeration applications. A reduction in magnetic entropy in deficiency and excess of manganese samples has been attributed to the magnetic inhomogeneity.

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Acknowledgements

The first author wishes to thank the Department of Science and Technology (DST), New Delhi, India, for providing financial assistance under Women Scientist Scheme-A (SR/WOS-A/PM-13/2018(G)). The first and corresponding authors acknowledge Dr. K.V. Siva Kumar (Retd. Prof.) for helping us in developing synthesis method and for valuable suggestions.

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Authors and Affiliations

  1. Department of Physics, University College of Science, Osmania University, Hyderabad, India

    K. Swetha & Y. Kalyana Lakshmi

  2. Department of Physics, School of Science, GITAM (Deemed to Be University), Hyderabad, India

    S. Bharadwaj

  3. Defence Metallurgical Research Laboratory, Hyderabad, India

    N. Pavan Kumar & J. Arout Chelvane

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Swetha, K., Bharadwaj, S., Kumar, N.P. et al. Above room temperature magnetic entropy in non-stoichiometric manganese of La0.67Sr0.33MnO3 manganites. Appl. Phys. A 128, 727 (2022). https://doi.org/10.1007/s00339-022-05879-1

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