Sharp angular sensitivity of pinning due to twin boundaries in Ba 2YCu3O7

E. M. Gyorgy, R. B. Van Dover, L. F. Schneemeyer, A. E. White, H. M. O'Bryan, R. J. Felder, J. V. Waszczak, W. W. Rhodes, F. Hellman

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Abstract

We have measured the pinning force due to twin boundaries by measuring the magnetic torque produced when a field is applied perpendicular to the c axis and rotated with respect to the ab axes. At 76 K, the torque increases roughly fourfold, when the field is within 2°of the parallel to the twin boundaries. This peak is absent at 27 K. Irradiation with 5×101 6 cm-2 3.5 MeV protons increases the overall critical current and eliminates the peaks observed at 76 K.

Original languageEnglish
Pages (from-to)2465-2467
Number of pages3
JournalApplied Physics Letters
Volume56
Issue number24
DOIs
StatePublished - 1 Dec 1990

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    Gyorgy, E. M., Van Dover, R. B., Schneemeyer, L. F., White, A. E., O'Bryan, H. M., Felder, R. J., Waszczak, J. V., Rhodes, W. W., & Hellman, F. (1990). Sharp angular sensitivity of pinning due to twin boundaries in Ba 2YCu3O7 Applied Physics Letters, 56(24), 2465-2467. https://doi.org/10.1063/1.103257