Vortex motion noise in YBa{sub 2}Cu{sub 3}O{sub x} films before and after heavy-ion irradiation
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Korea Institute of Science and Technology, Seoul 136-791 (Korea)
We have studied vortex motion noise in epitaxial YBa{sub 2}Cu{sub 3}O{sub x} films in magnetic fields before and after introducing columnar defects into the film by heavy-ion irradiation. Vortex motion exhibited a noise peak, which occurred at a field-dependent temperature. We found an {ital increased} noise peak magnitude after irradiation, and interpreted it as an increased bundle size, probably due to an increased {ital length} of vortex segments due to the interaction with pinned vortices in columnar defects. The magnetic field and the current dependence of the noise provided additional insights into the effects of columnar defects. After irradiation, the noise peak was almost independent of magnetic field, {ital B}, when it is less than about half of the matching field B{sub {phi}} but dropped by a factor of 3 for B{approximately}2B{sub {phi}}. On the other hand, for B{lt}0.5B{sub {phi}}, the bundle size was strongly current dependent at small current in the irradiated sample, but such a current dependence disappeared at higher currents or fields and was absent in the unirradiated sample. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 357302
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 60; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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