Abstract
The crystal structure and magnetic properties of polycrystalline Nd0.67Ba0.33Mn1 – xCuxO3 (x = 0, 0.02, 0.04, 0.06, 0.08, and 0.10) manganites are discussed. All the samples are crystallized into an orthorhombic crystal structure with Imma symmetry space group and the obtained lattice parameters confirm the presence of a co-operative Jahn–Teller effect for all the studied compounds. X-ray photoelectron spectra suggest the ratio of Mn3+/Mn4+ ions are observed to be decreasing systematically with the increase of Cu-content substitution and affects the Cu-ions oxidations states. The ferromagnetic (FM) to paramagnetic (PM) transition and magnetic moment is found to decrease systematically with the increase of Cu-content substitution leading to the suppression of double-exchange interactions. The theoretical and experimentally observed values of effective PM moment and saturation magnetic moment confirm the presence of inhomogeneous magnetic states containing FM and antiferromagnetic phases in all the samples. A magnetic phase change, i.e., from second-order transition to first-order transition is witnessed in between the 4 to 6 at wt % of the Cu substitution in Nd0.67Ba0.33MnO3 mixed-valence manganite.
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ACKNOWLEDGMENTS
The authors acknowledge to CSIR-NIIST for providing research facilities for carrying out this work. B. Sudakshina and B. Arun are is thankful to Council of Scientific and Industrial Research (CSIR), India for the award of Research Fellowships and also grateful to the Academy of Scientific and innovative Research (AcSIR), CSIR.
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The authors would like to acknowledge the financial support received from the Council of Scientific and Industrial Research (CSIR), Government of India, sponsored project MLP0031, and Department of Science and Technology, sponsored project no. GAP232339.
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Sudakshina, B., Arun, B. & Vasundhara, M. Structural, Magnetic, and Magneto-Caloric Properties of Cu-Substituted Nd0.67Ba0.33MnO3 Manganites. Phys. Solid State 62, 902–911 (2020). https://doi.org/10.1134/S1063783420050297
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DOI: https://doi.org/10.1134/S1063783420050297