Abstract
The polycrystalline samples with nominal composition Eu0.5Sr0.5Mn1−x Cr x O3 (0 ≤ x ≤ 0.1) were prepared by the conventional solid state reaction method and characterized by X-ray diffraction, scanning electron microscopy and electrical resistivity behavior without and with magnetic field. The structural parameters obtained by using Rietveld refinement of X-ray diffraction data showed that all samples crystallize with orthorhombic perovskite type symmetry with Pbnm space group. The scanning electron micrograph images reveal that the increase in Cr substitution hinders grain growth and grain connectivity. The temperature dependence of electrical resistivity show the semiconducting nature of these compounds and support the small polaron hoping model and variable range hopping conduction model. The calculated hopping distance and activation energy decreased as rate of Cr content increased whereas density of states at Fermi level increased. A large negative magnetoresistance is also present in the sample at the lowest temperature of measurements.
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Acknowledgments
The authors are thankful to University Grant Commission (UGC), New Delhi for providing the financial support. Authors are thankful to UGC-DAE CSR, Indore for providing characterization facilities. Authors are gratefully acknowledged Dr. Rajeev Rawat and Dr. Mukul Gupta for fruitful discussion.
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Modi, A., Bhat, M.A., Bhattacharya, S. et al. Investigation of structural and some physical properties of Cr substituted polycrystalline Eu0.5Sr0.5Mn1−xCrxO3 (0 ≤ x ≤ 0.1) manganites. J Mater Sci: Mater Electron 27, 8899–8905 (2016). https://doi.org/10.1007/s10854-016-4916-4
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DOI: https://doi.org/10.1007/s10854-016-4916-4