High-T/sub c/ thin films on low microwave loss alkaline-rare-earth-aluminate crystals

It is demonstrated that the alkaline-rare-earth aluminates (K/sub 2/NiF/sub 4/-type perovskites) are an excellent choice as the substrate material for the growth of high-T/sub c/ thin films suitable for microwave and far-infrared applications. The CaNdAlO/sub 4/ and SrLaAlO/sub 4/ single crystals have been grown by Czochralski pulling and fabricated into the form of