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Hopping Conductivity in a Single-Walled Carbon Nanotube Network |
| FANG Jing-Hai;LIU Li-Wei;KONG Wen-Jie;CAI Jian-Zhen;LU Li |
| Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100080 |
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| Cite this article: |
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FANG Jing-Hai, LIU Li-Wei, KONG Wen-Jie et al 2006 Chin. Phys. Lett. 23 953-955 |
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Abstract We investigate the resistance and magnetoresistance (MR) of an entangled single-walled carbon nanotube (SWNT) network. The temperature dependence of conductance is fitted by formula G(T)=G0exp[-(T0/T)1/2] with T0=15.8K at a wide temperature range from 4K to 300K. The MR defined by [R(T,H)-R(T,0)]/R(T,0) as a function of temperature and magnetic field perpendicular to the tube axis is negative at low temperatures. The MR amplitude increases as the temperature decreases at relative high temperature, but becomes decrease when temperature below 4K. The results are explained in terms of the coherent hopping of carriers in the presence of a Coulomb gap at low temperature.
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| Keywords:
72.80.Rj
67.55.Hc
61.48.+c
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Published: 01 April 2006
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