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Conduction mechanisms in carbon matrix containing ferromagnetic nanoparticles

Sajitha, EP and Prasad, V and Subramanyam, SV (2006) Conduction mechanisms in carbon matrix containing ferromagnetic nanoparticles. In: Physica B . (In Press)

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Abstract

We have investigated the low temperature resistance and magnetoresistance behaviour of the carbon matrix containing ferromagnetic nanoparticles. A range of compositions with different levels of disorder and varying iron content were prepared from the pyrolysis of organic precursor maleic anhydride and ferrocene. The temperature dependence of resistivity shows a negative temperature coefficient in the entire measurement range of 1.3 to 300 K. An increase in conductivity with the external magnetic field and a characteristic upturn at low temperature, is seen in all the compositions. The zero-field conductivity and the magnetoresistance can be explained with in the framework of two-dimensional electron-electron interaction model and the Kondo-like behaviour.

Item Type: Journal Article
Keywords: Localization conductivity;Magnetoresistance;Kondo effect
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 10 Aug 2006
Last Modified: 19 Sep 2010 04:31
URI: http://eprints.iisc.ernet.in/id/eprint/8304

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