Abstract

The reduction in flux motion resistivity due to pinning at twin boundaries in single crystal YBa 2Cu 3O x is demonstrated. Pinning takes place only for magnetic fields aligned within a critical angle of the twin boundary plane. The critical angle varies with field direction and with field strength for H | c. The onset temperature of twin boundary pinning is established by its strong anisotropy, and shown to correspond with a feature in the temperature dependent resistivity for H | c.

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