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High-Tc thin films on low microwave loss alkaline-rare-earth-aluminate crystals

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10 Author(s)
Sobolewski, R. ; Inst. Fizyki, Polska Akad. Nauk. Warszawa, Poland ; Gierlowski, P. ; Kula, W. ; Zarembinski, S.
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It is demonstrated that the alkaline-rare-earth aluminates (K2NiF4-type perovskites) are an excellent choice as the substrate material for the growth of high-Tc thin films suitable for microwave and far-infrared applications. The CaNdAlO 4 and SrLaAlO4 single crystals have been grown by Czochralski pulling and fabricated into the form of (001)-oriented wafers. The Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O/ss films deposited on these substrates by a single-target magnetron sputtering exhibited very good superconducting and structural properties. Dielectric properties of the CaNdAlO4 and SrLaAlO4 crystals at submillimeter-wave frequencies are also presented and compared to measurements of materials most commonly used as substrates for deposition of high-Tc films. The comparison shows that SrLaAlO4 is potentially the best material for millimeter-wave applications of high-Tc films because it combines excellent dielectric properties with a good lattice match with the Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O crystals

Published in:

Magnetics, IEEE Transactions on  (Volume:27 ,  Issue: 2 )

Date of Publication:

Mar 1991

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