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Improvement of Magnetocaloric Effects and Study of Magneto-Transport Behavior of Lanthanum Strontium Manganites by Grain Boundary Management via Additives

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Abstract

The structural, transport and magnetic properties of La0.67Sr0.33MnO3 with additives of ZrO2 and Bi2O3 were investigated and the results are presented. The studied samples showed a ferromagnetic-to-paramagnetic phase transition around 383 K, and a sharp transition was observed for the La0.67Sr0.33MnO3/Bi2O3 sample. A soft ferromagnetic behavior at room temperature was observed in all the La0.67Sr0.33MnO3 samples: however, the sample with bismuth oxide additive exhibited higher saturation magnetization and an enhanced magnetocaloric effect. In addition to a metal–insulator transition, a broad peak was observed in the ferromagnetic metallic region due to inhomogeneities arising from the antiferromagnetic interactions in the samples, and this disappeared with the application of a magnetic field. Positive magnetoresistance was observed for ZrO2 added to La0.67Sr0.33MnO3 for temperatures greater than 200 K.

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Acknowledgements

One of the authors, K. Swetha, wishes to thank the Department of Science and Technology (DST), New Delhi, India, for financial support under Women Scientist Scheme - SR/WOS-A/PM-13-2018 to carry out the present work. The authors would like to express gratitude to the UGC-NRC, School of Physics, University Of Hyderabad (UoH) for providing facilities to undertake XRD and FESEM measurements. The authors also thank the Centre Director of UGC-DAE CSR, Indore, India, for providing MR measurement facilities.

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Authors and Affiliations

  1. Department of Physics, University College of Science, Osmania University, Hyderabad, 500007, India

    K. Swetha, Kirana Kommuri & Y. Kalyana Lakshmi

  2. Department of Physics, School of Science, GITAM (Deemed to Be University), Hyderabad, 502329, India

    S. Bharadwaj

  3. UGC–DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore, 452001, India

    R. Venkatesh

  4. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad, 500058, India

    J. Arout Chelvane

  5. Ceramic Composite Materials Laboratory, Department of Physics, Sri Krishnadevaraya University, Anantapuram, Andhra Pradesh, 515003, India

    K. V. Siva Kumar

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Contributions

YKL (Corresponding Author): Conceptualization, Methodology, Project administration, Supervision, Writing–review & editing. SB: Writing–original draft, Validation, Methodology, Formal analysis. KS: Data curation, Investigation. RV: Data curation, Resources. JAC: Data curation, Resources. KVSK: Methodology, review & editing. All authors discussed the results and contributed to the final manuscript. The authors who do not meet the criteria for authorship are named in the Acknowledgements.

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Correspondence to Y. Kalyana Lakshmi.

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Swetha, K., Bharadwaj, S., Kommuri, K. et al. Improvement of Magnetocaloric Effects and Study of Magneto-Transport Behavior of Lanthanum Strontium Manganites by Grain Boundary Management via Additives. J. Electron. Mater. 52, 8250–8262 (2023). https://doi.org/10.1007/s11664-023-10748-5

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