Flux pinning by discontinuous columnar defects in 74 MeV Ag-irradiated YBa2Cu3O7 coated conductors |
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Authors: | NM Strickland EF Talantsev NJ Long JA Xia SD Searle J Kennedy A Markwitz MW Rupich X Li S Sathyamurthy |
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Institution: | 1. Industrial Research Ltd., P.O. Box 31310, Lower Hutt 5040, New Zealand;2. GNS Science, P.O. Box 31312, Lower Hutt, New Zealand;3. American Superconductor Corp., 64 Jackson Rd., Devens, MA 01434, USA |
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Abstract: | Linear damage tracks are created in production-quality YBCO coated conductors by irradiation with 61–74 MeV Ag ions. The ion tracks are observed by transmission electron microscopy to be elongated but discontinuous. The in-field transport critical current (Ic) is enhanced significantly for fields applied parallel to the irradiation direction with a broad peak appearing in the magnetic field-angle dependence of the critical current, coinciding with the irradiation direction. The zero-field Ic is typically reduced somewhat, however annealing at 200 °C partially restores this and enhances the in-field Ic even for field parallel to the irradiation direction. Lower energies tend to produce a weaker peak, but also retain the zero-field Ic to a greater extent, consistent with a trend of greater discontinuity in the ion tracks. |
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