High Magnetoresistance of the Composite of Polyaniline Nanotubes with La0.67Sr0.33MnO3 . Determination of Stiffness Constant and Range Of Interaction of this composite
K. Gupta1, P. C. Jana2, A. K. Meikap3 

1Kajal Gupta, Department of Physics, National Institute of Technology, Durgapur, India.
2Paresh Chanra Jana, Department of Physics and Technophysics, Vidyasagar University, Midnapore, West Bengal, India.
3Ajit Kumar Meikap, Department of Physics, National Institute of Technology, Durgapur, India.
Manuscript received on November 17, 2011. | Revised Manuscript received on November 29, 2011. | Manuscript published on January 05, 2012. | PP: 10-14 | Volume-1 Issue-6, January 2012. | Retrieval Number: E0247101511/2012©BEIESP
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: We have synthesized composite of polyaniline nanotubes with Lanthanum strontium manganite (La0.67Sr0.33MnO3, LSMO) nanoparticles. A huge increase in magnetoresistance (~73%) is obtained in the nanocomposite containing highest amount of LSMO. This increase in magnetoresistance may be explained by evaluating stiffness constant and average range of interaction of the nanocomposite. Average range of interaction among magnetic ions increases from 5 to 7.736 and value of stiffness constant decreases from 2.75 x 10-5 to 0.74 x 10-5 eV(A 0 ) 2 with increase in LSMO content in the nanocomposites. Increase in average range of interaction and decrease in stiffness constant may be the cause of observed increase in magnetoresistance.
Keywords: LSMO, Magnetoresistance, Polyaniline, Range of interaction, Stiffness constant.