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Study of the structural properties and temperature-dependent hopping conductivity mechanism to the analysis of nonlinearity exponent in Nd0.7−xCexSr0.3MnO3 manganites

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Abstract

In this report, we used a solid-state reaction method for the fabrication of the Nd0.7−xCexSr0.3MnO3 (with x = 0 and 0.15) manganite and study of its electrical as well as nonlinear conduction properties. The structural properties of the fabricated orthorhombic distorted perovskite materials were analysed using the Rietveld refinement and Williamson–Hall (W–H) plot from X-ray diffraction measurements. The metal–insulator transition temperature (TMI) shifts to lower temperatures side as the resistivity of the Nd0.7−xCexSr0.3MnO3 compounds increases, indicating that the metal–insulator transition temperature shifts to lower temperatures as the Ce substitution increases. By modifying the zero-frequency Ohmic conductance Σ0 by temperature, the real component of ac conductance Σ(T, f) of these polycrystalline manganite systems was measured as a function of temperature (T). The Σ(T, f) remnants nearly constant to the value Σ0 up to a given onset frequency (fc) and grow from Σ0 when frequency is increased from fc at a stable T. The presence of a general scaling framework for the ac conductance may be seen in the experimental data for Σ(T, f) at various temperatures, which falls on the same universal master curve. The fc scales from 0 to 1 as \({{f}_{c}\sim \Sigma }_{0}^{{x}_{f}}\), where xf is the nonlinearity exponent describing the onset. With the help of ac conduction data, it’s been determined that xf is particularly phase sensitive and may be used to characterise the many phases in manganite systems that result from temperature variations.

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Acknowledgements

Authors are thankful to the Department of Physics, Department of Electronics of Midnapore College (Autonomous) for various instruments facilities. We thank the CRF, IIT Kharagpur, India for providing the necessary facilities for caring out different measurement work. Authors are also thankful to the Department of Physics, Government General Degree College at Gopiballavpur-II.

Funding

This research is supported by UGC and DST for their constant financial assistance. Author AKB is thankful to Dept. of Higher Education, Science and Technology and Biotechnology, Government of West Bengal, India. Author TNG is thankful for financial support from RUSA 2.0 component: 8 to Midnapore College (Autonomous).

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  1. Department of Physics, Government General Degree College at Gopiballavpur-II, Jhargram, West Bengal, 721517, India

    Amit Kumar Bhunia

  2. Department of Electronics, Midnapore College (Autonomous), Midnapore, West Bengal, 721101, India

    Tilak Narayan Ghosh

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TNG assisted the problem of the research, carried out the measurement, and manuscript writing. AKB assisted the measurement, discussed and helped in drafting the manuscript. All authors read and approved the final manuscript.

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Bhunia, A.K., Ghosh, T.N. Study of the structural properties and temperature-dependent hopping conductivity mechanism to the analysis of nonlinearity exponent in Nd0.7−xCexSr0.3MnO3 manganites. J Mater Sci: Mater Electron 33, 17963–17977 (2022). https://doi.org/10.1007/s10854-022-08658-z

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  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10854-022-08658-z

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