Abstract
We have studied the superconducting properties of ultra-thin YBa 2Cu 3O 7 layers using trilayers of YBa 2Cu 3O 7 sandwiched between semiconducting (Pr xY 1-x)Ba 2Cu 3O 7 layers. We find that superconducting parameters such as the transition temperature T c, the upper critical field H c2(0), and the Pippard coherence length ξ 0 deviate from bulk values when the YBa 2Cu 3O 7 layer is thinner than four unit cells. The dependence of T c on the thickness of YBa 2Cu 3O 7 with different Pr composition x of the (Pr xY 1-x)Ba 2Cu 3O 7 adjacent layers shows a similar behavior, even though T c depends strongly on x. We obserbed a linear temperature dependence of H c2( T) from 1 to 100 unit-cell thick YBCO layers. The plot of the Pippard coherence length ξ 0 versus 1 T c ( R R n = 0.1 ) of 1–8 unit-cell YBCO shows a linear relationship suggesting no appreciable change in Fermi velocity.
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