Mohan, Rajneesh and Kumar, Naresh and Singha, Bharat and Gaura, N. K. and Bhattacharya, Shovit and Rayaprold, S. and Dogra, A. and Gupta, S. K. and Kim, S. J. and Singh, R. K. (2010) Colossal electroresistance in Sm(0.55)Sr(0.45)MnO(3). Journal of Alloys and Compounds, 508 (2). L32-L35. ISSN 0925-8388

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We report a colossal resistance drop around insulator-metal transition temperature (T(MI)) in Sm(0.55)Sr(0.45)MnO(3) induced by direct current. Polycrystalline samples of Sm(0.55)Sr(0.45)MnO(3) were synthesized through solid state reaction method. They have been investigated by X-ray diffraction for phase evaluation, scanning electron microscopy for grain morphology and dc resistivity measurement techniques for resistivity-temperature behavior. The resistivity-temperature behavior has been measured with different biasing currents (1 mA, 2.5 mA, 5 mA, 10 mA and 50 mA). With increasing biasing current, the resistivity of the samples decreased drastically. The change in the resistivity of the samples for bias currents 1 mA and 50 mA at T(MI) was found to be similar to 2560%. This phenomenon of electroresistance is discussed in view of strong interaction between carrier spins and localized spins in Mn ions and percolative mechanism of phase-separation. (c) 2010 Elsevier B.V. All rights reserved.

Item Type: Article
Subjects: Chemistry
Materials Science
Metallurgy & Metallurgical Engineering
Depositing User: Ms Neetu Chandra
Date Deposited: 27 Feb 2012 12:34
Last Modified: 26 Mar 2012 07:15

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