Abstract
We have studied structure, magnetic and transport properties of polycrystalline samples synthesized with nominal compositions Bi0.2−x Pr x Ca0.8MnO3 (x=0.00, 0.02, 0.04, 0.08, 0.12, 0.16 and 0.20) via a solid-state reaction route. Magnetic measurements show that substitution of Pr at Bi site strongly affect the magnetic and charge-ordering properties. It has been found that the charge-ordering temperature (T CO) decreases with increasing x up to x=0.12 and then after it increases with x up to x=0.20. A spin glass (SG) state has been observed at ∼105 K in all the samples. Pr doping also leads to enhancement in the magnetic moment up to x=0.12 and then after a decrease in magnetic moment up to x=0.20. A concomitant increase in resistivity up to x=0.04 and then decrease in resistivity up to x=0.20 is also observed. We propose that the local lattice distortion induced by the size mismatch between the A-site cations and 6s2 character of Bi3+ lone pair electron are responsible for the observed variation in the physical properties with doping content of Pr.
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One of the authors, Mr. Kamlesh Yadav is grateful to the Ministry of Human Resources and Development (MHRD), New Delhi, for the award of a fellowship.
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Yadav, K., Varma, G.D. Magnetic and Charge-Ordering Properties of Bi0.2−x Pr x Ca0.8MnO3 (0.0=x=0.20) Perovskite Manganite. J Supercond Nov Magn 25, 1097–1104 (2012). https://doi.org/10.1007/s10948-011-1374-3
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DOI: https://doi.org/10.1007/s10948-011-1374-3