Defect properties of neutron-irradiated YBa2Cu3O7 superconductors probed by positron annihilation

X. Lu, S. J. Wang, Y. C. Jean, P. H. Hor, Y. Y. Xue, Z. J. Huang, C. W. Chu

研究成果: Article同行評審

11 引文 斯高帕斯(Scopus)

摘要

The results of positron lifetime measurements as a function of a dose of fast neutron irradiation and of annealing temperature in the YBa2Cu3O7 supeconductors are presented. The mean positron lifetime is found to increase as a function of a dose of irradiation up to 9.0×1017 cm-2. From the results of positron lifetime experiments, we found two types of defects generated due to fast neutron irradiation: cationic vacancies (220 ps) and large microvoids (465 ps). From the results of isochronal annealing experiments, we found that the intensity corresponding to the large microvoid decreases as a function of increasing temperature. The annealing also produces a multivacancy cluster. A direct correlation between the concentration of large microvoids (size, 25±5) and the critical current density due to fast neutron irradiation is found.

原文English
頁(從 - 到)7989-7995
頁數7
期刊Physical Review B
45
發行號14
DOIs
出版狀態Published - 1992

All Science Journal Classification (ASJC) codes

  • 凝聚態物理學

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