Effect of Cr doping in Structure and Magneto-transport Properties of (La0.67Sr0.33)MnO3

Tejas M. Tank, Deepshikha Bhargava, S. P. Sanyal


The study of perovskite manganites La0.67Sr0.33Mn1-xCrxO3 (0? x ?0.10) has been carried out. The structure and magneto-transport properties of La0.67Sr0.33Mn1-xCrxO3 manganites are strongly dependent on the doping level x. Polycrystalline samples of La0.67Sr0.33Mn1-xCrxO3 (0? x ?0.10) were prepared by solid state reaction method. The little difference between the ionic radii of Cr3+ and Mn3+ causes no change in the structure, the structure remains rhombohedral. The temperature dependence of the resistivity is measured from 5 – 400 K without and with magnetic field upto 5 T. The value of metal-insulator (M-I) transition temperature (TP) decreases when resistivity increases for all the samples while doping level x increases. The value of magnetoresistance (MR %) increases with increases Cr doping level for all samples. We have calculated energy band gap (Eg) for all samples and it is revealed that as per doping level increases Eg increases which is comparable with experimental data. So, the structure and magneto-transport behavior pretentious by Cr doping.

Keywords: Colossal magnetoresistance, metal-insulator transition.

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ISSN (Paper)2224-719X ISSN (Online)2225-0638

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