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

Authors

Jung Ho Kim, University of WollongongFollow
S X. Dou, University of WollongongFollow
A Matsumoto, National Institute for Materials Science Japan
Seyong Choi, Buscan Center, Korea Basic Science Institute, Buscan, Republic of Korea
T Kiyoshi, Magnet Dev Group - NIMS Japan
Hiroaki Kumakura, National Institute For Materials Science

RIS ID

33920

Publication Details

Kim, J, Dou, SX, Matsumoto, A, Choi, S, Kiyoshi, T & Kumakura, H (2010), Correlation between critical current density and n-value in MgB2/Nb/Monel superconductor wires, In Proceedings of the 22nd International Symposium on Superconductivity (ISS 2009), 02-04 Nov, 2009, Tsukuba, Japan, Physica C: Superconductivity and its Applications, 470(20), pp. 1207-1210.

Abstract

Field and temperature dependences of critical current density (J_c) 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 J_c and the n-value, n X J^m_c we found that there was a strong relationship, m = 0.371, for both wires at 4.2 and 20 K. On the basis of our experiments, a larger J_c led to a higher n-value, whether there was doping or not.

Grant Number

ARC/DP0770205

Additional Grant Number

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