Abstract
We investigate the thermally activated flux motion in structures made of DyBa 2Cu 3O 7 layers separated by an alloy of (Y 1−xPr x)Ba 2Cu 3O 7. With x=0.4 we have grown a series of samples containing N layers of DyBa 2Cu 3O 7 (24Å thick, N between 1 and 10) separated by 96Å of (Y 0.6Pr 0.4)Ba 2Cu 3O 7. For H applied parallel to the c-axis, the activation energy for flux motion U, extracted from the lnϱ versus 1/T curves, increases linearly with N for N<3 and then progressively saturates, demonstrating the coupling of the superconducting layers through the alloy.
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