期刊
JOURNAL OF APPLIED PHYSICS
卷 104, 期 7, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.2996036
关键词
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资金
- Foundation of Basic Research of Republic of Belarus [F07F-013, F08MS-0340]
- NATO Collaborative Linkage [CBP. EAP. CLG982007]
- Lithuanian State Science and Studies Foundation [V-07018]
- INTAS [03-50-4409]
- CNRS/FRFRB [20356]
- [165.1]
Electrical and magnetotransport properties of single walled carbon nanotube (SWCNT) fibers are reported. The dependencies of resistance on temperature can be approximated by the Mott law for three-dimensional variable range hopping (VRH) below 80 K and by typical law for fluctuation induced tunneling model within the range of 80-300 K. Both negative and positive magnetoresistances (MRs) were observed. At low fields, MR is negative. Positive upturn was observed on the MR curves, which shifted to the high field's values with temperature increase. The upturn field of the MR effect was shifted from 1.5 T at 2 K to a value of about 20 T at 40 K. The value of positive MR varies as exp(B-2), which changes to B-1/3 at sufficiently high fields as expected for the VRH transport. The model of VRH transport is illustrated by the influence of strong microwave field and terahertz radiation induced photocurrent manifestation at low temperatures. (c) 2008 American Institute of Physics. [DOI: 10.1063/1.2996036]
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