Title :
High-Tc thin films on low microwave loss alkaline-rare-earth-aluminate crystals
Author :
Sobolewski, Roman ; Gierlowski, Pion ; Kula, Witold ; Zarembinski, S. ; Lewandowski, Stanislaw J. ; Berkowski, Marek ; Pajaczkowska, A. ; Gorshunov, B.P. ; Lyudmirsky, D.B. ; Sirotinsky, O.I.
Author_Institution :
Inst. Fizyki, Polska Akad. Nauk. Warszawa, Poland
fDate :
3/1/1991 12:00:00 AM
Abstract :
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
Keywords :
high-temperature superconductors; sputtered coatings; superconducting thin films; Bi-Sr-Ca-Cu-O/ss; CaNdAlO4; Czochralski pulling; SrLaAlO4; Y-Ba-Cu-O; alkaline-rare-earth-aluminate crystals; high temperature superconductor; low microwave loss; single-target magnetron sputtering; submillimeter-wave frequencies; substrate material; thin films; Crystalline materials; Crystals; Dielectric materials; Dielectric substrates; Sputtering; Superconducting films; Superconducting magnets; Superconducting microwave devices; Transistors; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
