Magnetic and electronic transport properties of nanocomposites of superconducting Mo carbides’ nanoparticles embedded in a ferromagnetic carbon matrix
Magnetic and electronic transport properties of nanocomposites of superconducting Mo carbides’ nanoparticles embedded in a ferromagnetic carbon matrix
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DOI：
10.1557/jmr.2009.0295
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发表时间：
2009-07
影响因子：
2.7
通讯作者：
Zhen Wang;Da Li;D. Geng;Song Ma;Wei Liu-;Z. D. Zhang
中科院分区：
文献类型：
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作者：
Zhen Wang;Da Li;D. Geng;Song Ma;Wei Liu-;Z. D. Zhang
研究了纳米复合材料的电子输运和磁性能，其中超导（SC）碳化钼纳米颗粒嵌入铁磁（FM）碳基体中形成三维SC-FM网络。高分辨率透射电子显微镜观察表明，纳米复合材料中的碳有有序和无序两种形式。纳米复合材料的磁性由铁磁碳基体决定。纳米复合材料电阻率的温度依赖性主要由碳基体决定，表现出半导电性。由于碳化钼和碳基体之间接触势垒的影响，在低温下观察到纳米复合材料在零偏压附近的特殊 I - V 曲线。
The electronic transport and magnetic properties of nanocomposites, in which nanoparticles of superconducting (SC) molybdenum carbides are embedded in a ferromagnetic (FM) carbon matrix to form a three-dimensional SC-FM network, are studied. The high-resolution transmission electron microscope observation shows that the carbon in the nanocomposites is in both ordered and disordered forms. The magnetic properties of the nanocomposites are ruled by the ferromagnetic carbon matrix. The temperature dependence of electrical resistivity of the nanocomposites is dominated by the carbon matrix, showing the semi-conductivity. The special I - V curves near the zero voltage bias of the nanocomposites are observed at low temperatures, due to the influence of contact barriers between molybdenum carbides and the carbon matrix.