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Low frequency noise and non-linear transport in charge-ordered manganites

Guha, A and Ghosh, A and Raychauhduri, AK (2001) Low frequency noise and non-linear transport in charge-ordered manganites. In: Proceedings of International APS/IEEE Conference on Noise in Physical Systems and 1/f Fluctuations, 22-25 Oct. 2001, Gainesville, FL, USA, pp. 81-84.

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Rare-earth manganites are known to show charge-ordering (CO). The CO state is unstable towards a number of external perturbations including an electric current and shows non linear conductivity. We have investigated the low frequency noise (f < 20 Hz) in a CO material - a single crystal of $Pr_{0.63}Ca_{0.37}MnO_3$ when the CO state is destabilized with a electric current. We find that the appearance of non linear transport (as seen by non-linear I-V curve) is accompanied by a large low frequency noise. The noise has, in addition to a 1/f nature, distinct low frequency components which change with applied current. Our experiments imply existence of a threshold current that would destabilize the CO state leading to non-linear conductivity

Item Type: Conference Paper
Publisher: World Scientific
Additional Information: Copyright of this article belongs to World Scientific
Keywords: 1 f noise;calcium compounds;charge ordered states;colossal;magnetoresistance;electrical conductivity;ferromagnetic materials;praseodymium compounds
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 09 Aug 2007
Last Modified: 27 Aug 2008 12:44
URI: http://eprints.iisc.ac.in/id/eprint/10446

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