A comparative study on field, temperature, and strain dependences of the critical current for doped and undoped MgB2 wires based on the percolation model

Authors

Sangjun Oh, National Fusion Research Institute
Jung Ho Kim, University of WollongongFollow
Kyuhwan Cho, National Fusion Research Institute Republic Korea
Chulhee Lee, National Fusion research Institute Republic Korea
Chan-Joong Kim, Korea Atomic Energy Research Institute
S. X. Dou, University of WollongongFollow
M Rindfleisch, Nuclear Hyper Tech Research, Inc
Mike Tomsic, Hyper Tech Research Incorporated, Columbus, OH, USA
Jung-Ho Ahn, Andong National University

RIS ID

31384

Publication Details

Oh, S., Kim, J., Cho, K., Lee, C., Kim, C., Dou, S. Xue., Rindfleisch, M., Tomsic, M. Ahn, J. (2009). A comparative study on field, temperature, and strain dependences of the critical current for doped and undoped MgB₂ wires based on the percolation model. Journal of Applied Physics, 106 (6), 063912-1-063912-5.

Abstract

Field, temperature, and strain dependences of the critical current for a SiC doped multifilamentary in situ MgB₂ wire have been studied. Measurement results were compared with that of the undoped wire, and the origin of the difference in the critical current is discussed. The critical current can be calculated with the percolation model considering the effect of anisotropy. The temperature dependence of the fitting parameters, the upper critical field along the ab-plane, and c-axis is compared with the dirty-limit two-gap theory. To assess the validity of the fitting parameters, resistive transition has been measured especially to extract the upper critical field directly. It is shown that even the resistive broadening can be well explained by a simple parallel path model using the fitting parameters obtained from the critical current analysis.

Grant Number

ARC/DP0770205

Additional Grant Number

http://purl.org/au-research/grants/ARC/DP0770205