c-Axis tunneling in YBa2Cu3O7-δ/PrBa2Cu3O7-δ superlattices
Abstract
In this work we report c-axis conductance measurements done on a superlattice based on a stack of 2 layers YBa2Cu3O7-δ and 7 layers PrBa2Cu3O7-δ (2:7). We find that these quasi-2D structures show no clear superconducting coupling along the c-axis. Instead, we observe tunneling with a gap of c=5.0 0.5 meV for the direction perpendicular to the superconducting planes. The conductance spectrum show well defined quasi-periodic structures which are attributed to the superlattice structure. From this data we deduce a low temperature c-axis coherence length of c=0.24 0.03 nm.
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