| Original Articles |
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Hopping and Non-universal Conductivity in Half-Metallic CrO2 Composites |
| CHEN Ya-Jie1;ZHANG Xiao-Yu1;CAI Tian-Yi1;LI Zhen-Ya1,2 |
| 1Department of Physics, Suzhou University, Suzhou 215006
2CCAST (World Laboratory), PO Box 8730, Beijing 100080 |
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| Cite this article: |
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CHEN Ya-Jie, ZHANG Xiao-Yu, CAI Tian-Yi et al 2003 Chin. Phys. Lett. 20 721-724 |
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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.
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| Keywords:
72.15.-v
75.50.Tt
72.80.Tm
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Published: 01 May 2003
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| PACS: |
72.15.-v
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(Electronic conduction in metals and alloys)
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75.50.Tt
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(Fine-particle systems; nanocrystalline materials)
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72.80.Tm
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(Composite materials)
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