Improvement in performance of electrically tunable devices based on nonlinear dielectric SrTiO{sub 3} using a homoepitaxial LaAlO{sub 3} interlayer

Journal Article · Sat Aug 01 00:00:00 EDT 1998 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.122031· OSTI ID:639819

Jia, Q X; Findikoglu, A T; Reagor, D ^[1]; Lu, P ^[2]

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1. Superconductivity Technology Center, Mail Stop K763, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. Department of Materials Science and Engineering, New Mexico Tech, Socorro, New Mexico 87801 (United States)

Improved structural and dielectric properties of nonlinear dielectric SrTiO{sub 3} thin films on LaAlO{sub 3} substrates were accomplished by incorporating a {ital homoepitaxial} LaAlO{sub 3} interlayer between the substrate and the dielectric film. Using this interlayer, the quality factor of SrTiO{sub 3} films with high-temperature superconducting YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} electrodes on LaAlO{sub 3} substrates was improved by more than 50{percent} at 4.2 GHz and 4 K. This improvement, combined with no change in nonlinearity, led to greater than a 50{percent} enhancement of the finesse factor (defined as the product of the quality factor and the fractional shift resonant frequency) for the coplanar waveguide microwave resonators. The reduced planar defect density in the SrTiO{sub 3} films was attributed to this improvement. {copyright} {ital 1998 American Institute of Physics.}

• OSTI ID: 639819
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 7 Vol. 73; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
66 PHYSICS
ALUMINIUM OXIDES
BARIUM COMPOUNDS
BARIUM OXIDES
COPPER OXIDES
CRYSTAL DEFECTS
DIELECTRIC MATERIALS
ELECTRODES
HIGH-TC SUPERCONDUCTORS
LANTHANUM OXIDES
MICROSTRUCTURE
MICROWAVE RADIATION
RESONATORS
STRONTIUM COMPOUNDS
STRONTIUM TITANATES
THIN FILMS
TRANSMISSION ELECTRON MICROSCOPY
WAVEGUIDES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES