DEPRESSION OF THE ZERO-TEMPERATURE SUPERFLUID DENSITY IN YBA2CU3O7 PRBA2CU3O7 HETEROSTRUCTURES/

Heterostructures made of thick (15 unit cells) insulating PrBa2Cu3O7(P BCO) and thin superconducting YBa2Cu3O7(YBCO), such as [PBCO](15)/[YBC O](n)/[PBCO](15) trilayers and decoupled [YBCO](n)/[PBCO](15) superlat tices [n=1,2... unit cells (UC)], were prepared by an in-situ laser ab lation technique. Both T-c and the inverse kinetic inductance L(K)(-1) (T), which is proportional to the effective superfluid density, are fo und to be depressed with respect to the corresponding values in bulk Y BCO. This behaviour is attributed to quantum phase fluctuations induce d by charging effects in the CuO2 planes.