Abstract
The depinning fields for the twinned orthorhombic domains in DyVO4 and Dy(AsxV1-x)O4 crystals have been determined from optical birefringence hysteresis measurements. In this Ising model system the depinning field in a mixed crystal (x=0.15) is found to be much smaller than that in pure DyVO4 at low temperatures. An impurity mechanism that assists the motion of domain walls appears to be more important than pinning by the random strain fields.
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