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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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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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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DOI: https://doi.org/10.1007/s11664-023-10748-5