Superconducting transition width under magnetic field in MgB2 polycrystalline samples

Authors

C.C Wang, ISEM & Anhui University China
R Zeng, University of WollongongFollow
Xun Xu, University of WollongongFollow
S. X. Dou, University of WollongongFollow

RIS ID

34679

Publication Details

Wang, C., Zeng, R., Xu, X. & Dou, S. X. (2010). Superconducting transition width under magnetic field in MgB2 polycrystalline samples. Journal of Applied Physics, 108 (9), 093907-1-093907-5.

Abstract

A systematic study on the superconducting transition width as a function of the applied magnetic field was performed in polycrystalline MgB₂. A quantitative, yet universal relation between the two parameters was observed in all of the ceramics. It was found that the width decreases linearly with decreasing field in pure MgB₂ samples. Whereas, samples with boron and/or Mg atoms partially replaced by other elements show this linear relation in the temperature range below 0.7–0.8 of the superconducting transition temperature (corresponding to a field of about 2 T), at temperatures higher than this range, an abnormal upturn in the width was found. This upturn is ascribed to multiple superconducting transitions. A core-shell model is proposed to describe the multiple transitions. © 2010 American Institute of Physics. Link to publishers version here

Grant Number

ARC/DP0879070, ARC/DP0770205

Additional Grant Number

http://purl.org/au-research/grants/ARC/DP0879070

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