Influence of fast neutron irradiation on inter- and intragrain properties of ceramic YBa/sub 2/Cu/sub 3/O/sub 7
| Autor: | R. Flükiger, I. Apfelstedt, H. Küpfer, H. Scheurer, R. Meier-Hirmer, Th. Wolf, U. Wiech |
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| Rok vydání: | 1989 |
| Předmět: |
Superconductivity
Range (particle radiation) Materials science Flux pinning High-temperature superconductivity Fast neutron irradiation Condensed matter physics Fluence Crystallographic defect Electronic Optical and Magnetic Materials law.invention law visual_art visual_art.visual_art_medium Ceramic Electrical and Electronic Engineering |
| Zdroj: | IEEE Transactions on Magnetics. 25:2303-2306 |
| ISSN: | 0018-9464 |
| DOI: | 10.1109/20.92769 |
| Popis: | Fast neutron irradiation of YBa/sub 2/Cu/sub 3/O/sub 7/ leads to a decrease of T/sub c/, the variation of the ratio T/sub c/( Phi t)/T/sub c/(O) being comparable to that observed in conventional superconducting compounds. Superconductivity vanishes above a fluence of 2*10/sup 19/ cm/sup 2/. The phase-locking temperature of the intergrain junctions decreases faster with fluence than T/sub c/. Lower AC losses due to a complete destruction of weak links and lower intergrain critical-current densities with increasing fluence reflect in addition a larger radiation sensitivity of the intergrain junction properties. The intragrain critical-current density j/sub cG/ increases with increasing fluence, but its dependence on B and Phi t is not at all in accordance with increasing pinning by radiation-induced defects and decreasing T/sub c/. The intragrain current drops remarkably at low fields, passing a minimum and a subsequent maximum beyond which the common decrease of j/sub cG/ with increasing field is observed. The low-field behavior, together with the much lower increase of j/sub cG/ with fluence than above the maximum, points to a junction character of the current in this field range. > |
| Databáze: | OpenAIRE |
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