Abstract
The effect of the twin boundaries on flux motion has been studied by using a densely twinned and a perfectly detwinned domain in the same 123 single crystal. The most successful detwinning of the 123 crystals was a thermomechanical treatment under inert gas, which kept the perfectly detwinned domain after oxygen annealing. The influence of the twin boundaries on flux motion strongly depended on temperature. The presence of the twin boundaries brought about a reduction of the flux pinning force in low temperature, but with an increase in temperature, the twin boundaries worked as strong pins.
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