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

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

2000-02-04

arxiv.org/abs/cond-mat/0002066v1

Physics

Condensed Matter

Superconductivity

15 pages, 5 figures. To appear in Phys.Rev.B

Scientific paper

10.1103/PhysRevB.61.9162

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

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