Abstract
We have studied the thermally activated flux-flow resistance in YBa{sub 2}Cu{sub 3}O{sub 7}/PrBa{sub 2}Cu{sub 3}O{sub 7} (YBCO/BrBCO) artificial superlattices in magnetic fields perpendicular to the {ital a}-{ital b} plane. We find for multilayers with thick enough ({gt}24 A) insulating PrBCO layers and for YBCO thicknesses smaller than 300 A that the activation energy has a logarithmic magnetic field dependence and that is is proportional to the YBCO thickness in the multilayer.
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