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Magnetic Flux Pinning in YBa2Cu3O7 Films

  • H. R. Kerchner (a1), R. Feenstra (a1), J. O. Thomson (a2), J. R. Thompson (a2), D. K. Christen (a1), S. T. Sekula (a1) and L. A. Boatner (a1)...

Abstract

The magnetic hysteresis was studied for YBa2Cu3O7 films of different epitaxial orientations on single-crystal SrTiO3 and KTaO3 substrates. Deposition by coevaporation of Y, BaF2, and Cu was followed by annealing in flowing, wet oxygen at 800-850°C. The critical current density Jc deduced from magnetic hysteresis loops was compared with four-terminal transport-current results. Thermally activated magnetic flux flow was manifest in the audio-frequency data. Jc fits a scaling law similar to one used for describing Nb3Sn and other A15 materials.

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1 Feenstra, R., Boatner, L. A., Budai, J. D., Christen, D. K., Galloway, M. D., and Poker, D. E., Appl. Phys. Lett. 54, 1063 (1989).
2 Nelson, D. R., Phys. Rev. Lett. 60, 1073 (1988).
3 Tinkham, M., Phys. Rev. Lett. 61, 1658 (1988).
4 Christen, D. K., et al. ., this proceedings.
5 Kramer, E. J., J. Appl. Phys. 44,1360 (1973).
6 Budai, J. D., private communication.
7 Galloway, M. D., private communication.

Magnetic Flux Pinning in YBa2Cu3O7 Films

  • H. R. Kerchner (a1), R. Feenstra (a1), J. O. Thomson (a2), J. R. Thompson (a2), D. K. Christen (a1), S. T. Sekula (a1) and L. A. Boatner (a1)...

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