Perpendicular transport properties of YBa_2Cu_3O_{7-\delta}/PrBa_2Cu_3O_{7-\delta} superlattices
/ Authors
/ Abstract
The coupling between the superconducting planes of YBa 2 Cu 3 O 7 − δ / PrBa 2 Cu 3 O 7 − δ superlattices has been measured by c-axis transport. We show that only by changing the thickness of the superconducting YBa 2 Cu 3 O 7 − δ layers, it is possible to switch between quasi-particle and Josephson tunneling. From our data we deduce a low temperature c-axis coherence length of ξ c = 0 . 27 nm.