%0 Journal Article
%A Q Li
%A X.X Xi
%A X.D Wu
%A A Inam
%A S Vadlamannati
%A W.L McLean
%A T Venkatesan
%A Ramamoorthy Ramesh
%A D.M Hwang
%A J.A Martinez
%A L Nazar
%B Physical Review Letters
%D 1990
%G eng
%P 3086-3089
%R 10.1103/PhysRevLett.64.3086
%T Interlayer coupling effect in high-Tc superconductors probed by YBa2Cu3O7-x/PrBa2Cu3O7-x superlattices
%V 64
%X The effect of coupling between layers of the high-Tc superconductors was studied by varying both the YBa2Cu3O7-x and PrBa2Cu3O7-x layer thicknesses in YBa2Cu3O7-x/PrBa2Cu3O7-x superlattices. Superconductivity was found even when the YBa2Cu3O7-x layers had nominal thicknesses as small as 12 (one unit-cell thickness) but coupling between unit-cell layers is needed to achieve a Tc of 90 K. The decrease of Tc in isolated YBa2Cu3O7-x layers with increasing sheet resistance is on the same scale of about Latin small letter h with stroke/e2 as observed for ordinary superconductors. © 1990 The American Physical Society.