Correlation between critical current density and n-value in MgB2/Nb/Monel superconductor wires

Field and temperature dependences of critical current density (Jc) and n-value were evaluated from un-doped and carbon doped MgB2 wires, supplied by the Hyper Tech Research, Inc. In order to explore the possibility of persistent current mode, the variation of n-values for the different MgB2 conducto...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2010-11, Vol.470 (20), p.1207-1210
Main Authors: Kim, J.H., Dou, S.X., Matsumoto, A., Choi, S., Kiyoshi, T., Kumakura, H.
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Critical current density
Critical currents
Electrical engineering. Electrical power engineering
Exact sciences and technology
Malic acid doped MgB2 wire
Materials
n-value
Persistent current mode
Physics
Properties of type I and type II superconductors
Superconductivity
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Summary:Field and temperature dependences of critical current density (Jc) and n-value were evaluated from un-doped and carbon doped MgB2 wires, supplied by the Hyper Tech Research, Inc. In order to explore the possibility of persistent current mode, the variation of n-values for the different MgB2 conductors was studied in more detail. It was observed that the n-value decreased gradually with an increasing magnetic field and operating temperature. From the power-law relationship between the Jc and the n-value, n∝Jcm, we found that there was a strong relationship, m=0.371, for both wires at 4.2 and 20K. On the basis of our experiments, a larger Jc led to a higher n-value, whether there was doping or not.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2010.05.075