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
DOI 10.1103/PhysRevB.45.7989 · Physical Review B
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Abstract
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 (τ≊220 ps) and large microvoids (τ≊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 Å) and the critical current density due to fast neutron irradiation is found.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94 | Pressure unresolved | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure unresolved | unknown |
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