We have artificially varied the coupling between ultrathin YBa₂{Cu}₃O₇ layers by interposing insulating planes of PrBa₂{Cu}₃O₇ in multilayers and studied the consequences of decoupling 12-A{} YBa₂{Cu}₃O₇ unit cells on the superconducting properties. We find that the Tc (midpoint) of a 12-A{}/12-A{} multilayer is 55 K, twice that of the corresponding alloy. Tc decreases linearly with further separation of the YBa₂{Cu}₃O₇ unit cells, the transition width increases and shows evidence of 2D fluctuations, and the influence of a magnetic field parallel to the layers is markedly reduced.
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Triscone et al. (1990) studied this question.