Low-loss YBa2Cu3O7 films on flexible, polycrystalline-yttria-stabilized zirconia tapes for cryoelectronic applications

High-temperature superconducting films on flexible, low-thermal conductivit y, low-loss substrates offer a unique base for the development of cryoelect ronic digital interconnects. Using an ion-beam-assisted pulsed-laser-deposi tion technique, we developed biaxially textured YBa2Cu3O7 (YBCO) films on f lexible polycrystalline-yttria-stabilized zirconia (YSZ) substrates with th e following materials properties: (i) in-plane x-ray Phi -scan full width a t half maximum of similar to7 degrees; (ii) transition temperatures (T-c) i n the range of 88-89 K with transition widths (DeltaT(c)) of similar to0.5 K; (iii) critical current densities (J(c)) in the range 1.5-2x10(6) A/cm(2) at 77 K, zero field; (iv) magnetic penetration depth (lambda) of 284 nm at 77 K; and (v) surface resistance (R-s) of 700 mu Omega at 77 K, 10 GHz. Th e low-microwave loss, biaxilly textured YBCO films combined with the low-th ermal conductivity YSZ substrate could facilitate a variety of RF cryoelect ronic applications. (C) 2001 American Institute of Physics.