Low-loss YBa2Cu3Oy Films on Flexible, Polycrystalline-Yttria-Stabilized Zirconia Tapes for Cryoelectronic Applications

摘要

High-temperature superconducting films of flexible, low-thermal conductivity, low-loss substrates offer a unique base for the development of cryoelectronic digital interconnects. Using an ion-beam-assisted pulsed-laser- deposition technique, we developed biaxially textured YBa(2)Cu(3)O(7) (YBCO) films on flexible polycrystalline-yttria-stabilized zirconia (YSZ) sybstrates with the following materials properties: (i) in-plane x-ray phi-scan full width at half maximum of approx. 7 deg.; (ii) transition temperatures (T(c)) in the range of 88-89 K with transition widths (DELTA T(c)) of approx. 0.5 K; (iii) critical current densities (J(c)) in the range 1.5 - 2 x 10(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 muOMEGA at 77 K, 10 GHz. The low-microwave loss, biaxilly textured YBCO films combined with the low-thermal conductivity YSZ substrate could facilitate a variety of RF cryoelectronic applications.