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c-Axis tunneling in YBa2Cu3O7-δ/PrBa2Cu3O7-δsuperlattices

J. C. Martinez·A. Schattke·M. Jourdan·G. Jakob·H. Adrian
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Abstract

In this work we report c-axis conductance measurements done on a superlattice based on a stack of 2 layers YBa2Cu3O{7-δ} and 7 layers PrBa2Cu3O{7-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 Δ_c=5.0\pm 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 ξ_c=0.24\pm 0.03 nm.

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J. C. Martinez, A. Schattke, M. Jourdan, G. Jakob, H. Adrian. 2000-02-04. c-Axis tunneling in YBa2Cu3O7-δ/PrBa2Cu3O7-δsuperlattices. https://doi.org/10.1103/physrevb.61.9162

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