Microwave surface resistance of YBaCuO superconducting films laser-ablated on copper substrates

In order to apply high-T/sub c/ material to a real accelerator cavity, it may be indispensable that the material is deposited on metal substrate. It is now possible to align the c axis of YBa/sub 2/Cu/sub 3/O/sub y/ (YBCO) film perpendicular to a metal surface. Furthermore, the constituent crystals can be in-plane aligned with a laser ablation technique following the formation of yttria-stabilized-zirconia (YSZ) buffer layer of controlled grain orientation. Using a demountable copper cavity operated at 13 GHz in the TE/sub 011/ mode, the microwave surface resistance was measured over a temperature range from 11 K to 300 K.