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Colossal electroresistance in Sm(0.55)Sr(0.45)MnO(3)

IR@NPL: CSIR-National Physical Laboratory, New Delhi


Field	Value

Title	Colossal electroresistance in Sm(0.55)Sr(0.45)MnO(3)

Creator	Mohan, Rajneesh Kumar, Naresh Singha, Bharat Gaura, N. K. Bhattacharya, Shovit Rayaprold, S. Dogra, A. Gupta, S. K. Kim, S. J. Singh, R. K.

Subject	Chemistry Materials Science Metallurgy & Metallurgical Engineering

Description	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.

Publisher	Elsevier

Date	2010-08-24

Type	Article PeerReviewed

Format	application/pdf

Identifier	http://npl.csircentral.net/46/1/38.pdf 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

Relation	http://www.sciencedirect.com/science/article/pii/S0925838810021055 http://npl.csircentral.net/46/