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
刊名	Physical Review B
	2006
卷号	73 期号:19
关键词	zero-dimensional superconductor granular metal-films particles conduction nanocapsules percolation samples
ISSN号	1098-0121
中文摘要	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.
原文出处	://WOS:000237950400026
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/34294]
专题	金属研究所_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).