Abstract
AbstractThe influence of neutron irradiation on the angular, field and temperature dependence of the critical transportcurrent density J c of YBa 2 Cu 3 O 7 d (Y-123) thick films, as well as on the irreversibility fields was investigated. Thespecimens were deposited by liquid phase epitaxy either directly on NdGaO 3 or on seeded (100)MgO substrates with afinal Y-123 layer thickness of 1 and 5–10 lm, respectively. XRD of the superconducting layers proves good in-planeand out-of-plane alignments with FWHMs below 2 . The specimens showed excellent irreversible properties withcritical current densities of up to 3 10 9 A/m 2 at zero field and 77 K and irreversibility fields above 7 T at 77 K for Hkcprior to neutron irradiation, which was performed in fast neutron fluence steps of 10 21 m 2 , corresponding to 5 10 21 defect cascades per m 3 per step. J c enhancements by 100% and an anisotropy reduction by a factor of 2 are achieved atthe optimum neutron fluence. 2003 Elsevier B.V. All rights reserved.
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