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Title of article :
Magnetic field induced delocalization in multi-wall carbon nanotube-polystyrene composite at high fields
Author/Authors :
Bhatia، نويسنده , , Ravi and Galibert، نويسنده , , Jean and Menon، نويسنده , , Reghu، نويسنده ,
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روزنامه با شماره پیاپی سال 2014
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Abstract :
In well dispersed multi-wall carbon nanotube-polystyrene composite of 15 wt%, with room temperature conductivity of ∼5 S/cm and resistivity ratio [R2 K/R200 K] of ∼1.4, the temperature dependence of conductivity follows a power-law behavior. The conductivity increases with magnetic field for a wide range of temperature (2–200 K), and power-law fits to conductivity data show that localization length (ξ) increases with magnetic field, resulting in a large negative magnetoresistance (MR). At 50 T, the negative MR at 8 K is ∼13% and it shows a maximum at 90 K (∼25%). This unusually large negative MR indicates that the field is delocalizing the charge carriers even at higher temperatures, apart from the smaller weak localization contribution at T < 20 K. This field-induced delocalization mechanism of MR can provide insight into the intra and inter tube transport.
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