Hopping and Non-universal Conductivity in Half-Metallic CrO2 Composites
CHEN Ya-Jie1 , ZHANG Xiao-Yu1 , CAI Tian-Yi1 , LI Zhen-Ya1,2
1 Department of Physics, Suzhou University, Suzhou 215006
2 CCAST (World Laboratory), PO Box 8730, Beijing 100080
Hopping and Non-universal Conductivity in Half-Metallic CrO2 Composites
CHEN Ya-Jie1 ;ZHANG Xiao-Yu1 ;CAI Tian-Yi1 ;LI Zhen-Ya1,2
1 Department of Physics, Suzhou University, Suzhou 215006
2 CCAST (World Laboratory), PO Box 8730, Beijing 100080
关键词 ：
72.15.-v ,
75.50.Tt ,
72.80.Tm
Abstract ： We study the dependence of resistivity ρ on conducting volume fraction p in CrO2 /TiO2 magnetic composite that is composed of acicular half-metallic particles and spherical insulating particles. The measured percolation threshold was determined to be pc = 0.192. It is found that the conductivity exhibits a non-universal critical exponent t = 2.52±0.08, which may be dominantly attributed to microstructure and higher-order hopping in this composite.
Key words ：
72.15.-v
75.50.Tt
72.80.Tm
出版日期: 2003-05-01
:
72.15.-v
(Electronic conduction in metals and alloys)
75.50.Tt
(Fine-particle systems; nanocrystalline materials)
72.80.Tm
(Composite materials)
引用本文:
CHEN Ya-Jie;ZHANG Xiao-Yu;CAI Tian-Yi;LI Zhen-Ya;. Hopping and Non-universal Conductivity in Half-Metallic CrO2 Composites[J]. 中国物理快报, 2003, 20(5): 721-724.
2 Composites. Chin. Phys. Lett., 2003, 20(5): 721-724.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y2003/V20/I5/721
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2003, Vol. 20 
