Title

Sharp Angular Sensitivity of Pinning Due to Twin Boundaries in Ba 2ycu3o7

Document Type

Article

Publication Date

12-1-1990

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.

DOI

10.1063/1.103257

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