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Piezoresistivity in films of nanocrystalline manganites

Sarkar, Jayanta and Raychaudhuri, AK (2007) Piezoresistivity in films of nanocrystalline manganites. In: Journal of Nanoscience and Nanotechnology, 7 (6). pp. 2058-2062.

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Rare earth manganites having perovskite structure are susceptible to lattice strain. So far most investigations have been done with hydrostatic pressure or biaxial strain. We have observed that hole doped rare-earth manganites, which are known to display colossal magnetoresistance (CMR) also show change in its resistance under the influence of uniaxial strain. We report the direct measurement of piezoresistive response of $La_{0.67}Ca_{0.33}MnO_3, (LCMO)$ and $La_{0.67}Sr_{0.33}MnO_3 (LSMO)$ of this manganite family. The measurements were carried out on nanostructured polycrystalline films of LCMO and LSMO grown on oxidized Si(100) substrates. The piezoresistance was measured by bending the Si cantilevers (on which the film is grown) in flexural mode both with compressive and tensile strain. At room temperature the gauge factor similar to 10-20 and it increases to a large value near metal-insulator transition temperature $(T_p)$ where the resistivity shows a peak.

Item Type: Journal Article
Publication: Journal of Nanoscience and Nanotechnology
Publisher: American Scientific Publishers
Additional Information: Copyright of this article belongs American Scientific Publishers.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 06 Aug 2007
Last Modified: 02 Feb 2012 09:39
URI: http://eprints.iisc.ac.in/id/eprint/11657

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