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

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

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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 (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.

Original language	English
Pages (from-to)	7989-7995
Number of pages	7
Journal	Physical Review B
Volume	45
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.45.7989
Publication status	Published - 1992

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1103/PhysRevB.45.7989

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title = "Defect properties of neutron-irradiated YBa2Cu3O7 superconductors probed by positron annihilation",

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 (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.",

author = "X. Lu and Wang, {S. J.} and Jean, {Y. C.} and Hor, {P. H.} and Xue, {Y. Y.} and Huang, {Z. J.} and Chu, {C. W.}",

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TY - JOUR

T1 - Defect properties of neutron-irradiated YBa2Cu3O7 superconductors probed by positron annihilation

AU - Lu, X.

AU - Wang, S. J.

AU - Jean, Y. C.

AU - Hor, P. H.

AU - Xue, Y. Y.

AU - Huang, Z. J.

AU - Chu, C. W.

PY - 1992

Y1 - 1992

N2 - 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.

AB - 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.

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

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