Electronic transport properties of NbC(C)-C nanocomposites

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	Electronic transport properties of NbC(C)-C nanocomposites
	D. Li; W. F. Li; S. Ma; Z. D. Zhang
	2006
发表期刊	Physical Review B
ISSN	1098-0121
卷号	73 期号:19
摘要	We report the electronic transport properties of a composite system comprising zero dimensional superconducting NbC(C) nanocapsules and carbon nanofiber matrix. DC susceptibility measurements of the nanocomposite indicate that the critical temperature (T-C) of NbC nanocrystals is 10.7 K. The temperature dependence of electrical resistivity of the specimen pellet follows the Mott's T-1/4 law in a temperature range between T-C of NbC and 300 K, owing to a strong degree of structural disorder in the carbon matrix. Below the T-C of NbC, when the change of its electrostatic energy Delta E is far greater than the thermal energy, an electron will be localized on an isolated NbC nanocrystal at very low temperatures, leading to "Coulomb Blockade." As a result, a collective behavior of the single-electron tunneling effect takes place in a three-dimensional granular superconductors' network composed of the NbC/carbon/NbC tunneling junctions. The superconducting gap of NbC crystals is not found in the current-voltage curves, due to the suppression of surface superconductivity through the contact between NbC and carbon shells.
部门归属	chinese acad sci, met res inst, shenyang natl lab mat sci, shenyang 110016, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.;li, d (reprint author), chinese acad sci, met res inst, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china
关键词	Zero-dimensional Superconductor Granular Metal-films Particles Conduction Nanocapsules Percolation Samples
URL	查看原文
WOS记录号	WOS:000237950400026
引用统计	被引频次：27[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34294
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	D. Li,W. F. Li,S. Ma,et al. Electronic transport properties of NbC(C)-C nanocomposites[J]. Physical Review B,2006,73(19).
APA	D. Li,W. F. Li,S. Ma,&Z. D. Zhang.(2006).Electronic transport properties of NbC(C)-C nanocomposites.Physical Review B,73(19).
MLA	D. Li,et al."Electronic transport properties of NbC(C)-C nanocomposites".Physical Review B 73.19(2006).