Low-loss substrate for microwave application of high-temperature superconductor films

Journal Article · Mon Sep 24 04:00:00 EDT 1990 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.103481· OSTI ID:6432222

Brown, R; Pendrick, V; Kalokitis, D ^[1]; Chai, B H.T. ^[2]

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1. David Sarnoff Research Center, Princeton, NJ (USA)
2. Allied-Signal Inc., Morristown, NJ (USA)

We have shown that strontium lanthanum aluminate (SrLaAlO{sub 4}) has considerable potential as a substrate material for high-temperature superconductor (high {Tc}) microwave applications. Excellent lattice match is obtainable on a 14{degree} tilt from the {ital c} axis. The lattice dimensions encourage {ital ab} plane epitaxial growth. The thermal expansion was found to be 7.4{times}10{sup {minus}6} {degree}C{sup {minus}1}. Patterned sputtered niobium resonators on SrLaAlO{sub 4} exhibit {ital Q} values at 5 K comparable to similar niobium resonators on polycrystalline alumina, ({ital Q}{gt}10 000 from 2 to 15 GHz). Deposited YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} (YBCO) films on this substrate show sharp ac susceptibility transitions indicating good homogeneity and {ital ab} plane orientation.

• OSTI ID: 6432222
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 57:13; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

426001* -- Engineering-- Superconducting Devices & Circuits-- (1990-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ALUMINATES
ALUMINIUM COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
EXPANSION
FILMS
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
MICROWAVE RADIATION
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
SUBSTRATES
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
THERMAL EXPANSION
TRANSITION ELEMENT COMPOUNDS
USES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES