Raman study on the effects of sintering temperature on the Jc(H) performance of MgB2 superconductor

Authors

W. X. Li, Shanghai University
R. H. Chen, Shanghai University
Y. Li, Shanghai University
M. Y. Zhu, Shanghai University
H. M. Jin, Shanghai University
R. Zeng, University of WollongongFollow
S. X. Dou, University of WollongongFollow
B. Lu, Shanghai University

RIS ID

23013

Publication Details

This article was originally published as Li, WX, Chen, RH, Li, Y, Zhu, MY, Jin, HM, Zeng, R, Dou, SX, Lu, B, Raman study on the effects of sintering temperature on the Jc(H) performance of MgB2 superconductor, Journal of Applied Physics, 103(1), 2008, 013511-1-013511-5. Copyright American Institute of Physics 2008. Original journal article available here

Abstract

The influence of sintering temperature on the critical transition temperature T_c and critical current density J_c for the MgB₂ superconductor was investigated systematically with the observation of Raman scattering measurement and flux pinning force F_panalysis. The enhanced E_2g mode in Raman spectra with increasing in situ sintering temperature shows gradual strengthening of the electron-phonon coupling in MgB₂, which means that the crystals become more harmonic after higher temperature sintering. However, the crystal harmonicity is degraded for samples sintered at even higher temperature due to Mg deficiency. A possible explanation for the J_c(H) performance, which is in accordance with the Raman spectroscopy observation and F_p analysis, is the cooperation between the electron-phonon coupling in the E_2g mode and the flux pinning centers, mainly originating from the lattice distortion due to the different sintering temperatures.

Grant Number

ARC/DP0770205

Additional Grant Number

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