Magnetoreresistance of carbon nanotube-polypyrrole composite yarns

被引：2
作者：
Ghanbari, R. [1 ,2 ]
Ghorbani, S. R. [1 ,2 ]
Arabi, H. [1 ,2 ]
Foroughi, J. [3 ]
机构：
[1] Ferdowsi Univ Mashhad, Dept Phys, Renewable Energies Magnetism & Nanotechnol Lab, Fac Sci, Mashhad, Iran
[2] Ferdowsi Univ Mashhad, Res Ctr Hydrogen Storage & Lithium Ion Batteries, Fac Sci, Mashhad, Iran
[3] Univ Wollongong, Intelligent Polymer Res Inst, ARC Ctr Excellence Electromat Sci, Wollongong, NSW 2519, Australia
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2018年 / 548卷
关键词：
Carbon nanotube; Polypyrrole yarns; Electrical conductivity; Magnetoresistance; CONDUCTIVITY;
D O I：
10.1016/j.physc.2018.02.046
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Three types of samples, carbon nanotube yarn and carbon nanotube-polypyrrole composite yarns had been investigated by measurement of the electrical conductivity as a function of temperature and magnetic field. The conductivity was well explained by 3D Mott variable range hopping (VRH) law at T < 100 K. Both positive and negative magnetoresistance (MR) were observed by increasing magnetic field. The MR data were analyzed based a theoretical model. A quadratic positive and negative MR was observed for three samples. It was found that the localization length decreases with applied magnetic field while the density of states increases. The increasing of the density of states induces increasing the number of available energy states for hopping. Thus the electron hopping probability increases in between sites with the shorter distance that results to small the average hopping length.
引用
收藏
页码：78 / 81
页数：4
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