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Magnetic and electronic transport properties of nanocomposites of superconducting Mo carbides’ nanoparticles embedded in a ferromagnetic carbon matrix

Published online by Cambridge University Press:  31 January 2011

Zhen H. Wang ,
Da Li ,
Dianyu Geng ,
Song Ma ,
Wei Liu  and
Z.D. Zhang
Zhen H. Wang*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, and International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Z.D. Zhang
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, and International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: zhwang@imr.ac.cn
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Abstract

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.

Keywords

Magnetic propertiesNanoscaleX-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 7 , July 2009 , pp. 2229 - 2234
Copyright
Copyright © Materials Research Society 2009

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