No Access Submitted: 31 August 2007 Accepted: 07 November 2007 Published Online: 14 January 2008
Journal of Applied Physics 103, 013511 (2008);
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  • a)Also at Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia.

    b)Author to whom correspondence should be addressed. Electronic mail: [email protected]

View Contributors
  • W. X. Li
  • R. H. Chen
  • Y. Li
  • M. Y. Zhu
  • H. M. Jin
  • R. Zeng
  • S. X. Dou
  • B. Lu
The influence of sintering temperature on the critical transition temperature Tc and critical current density Jc for the MgB2 superconductor was investigated systematically with the observation of Raman scattering measurement and flux pinning force Fp analysis. The enhanced E2g 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 Jc(H) performance, which is in accordance with the Raman spectroscopy observation and Fp analysis, is the cooperation between the electron-phonon coupling in the E2g mode and the flux pinning centers, mainly originating from the lattice distortion due to the different sintering temperatures.
The authors are grateful to Dr. T. Silver for fruitful discussion. The authors also thank the Natural Science Foundation of China (Grant No. 50471100), the Australian Research Council, Hyper Tech Research, Inc., and CMS Alphatech International Ltd. for their financial support.
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