DOI: 10.1063/1.364155. High tunability of the permittivity of YBa2Cu3O7−∂/SrTiO3 heterostructures on sapphire substrates

High tunability of the permittivity of YBa2Cu3O7−∂/SrTiO3 heterostructures on sapphire substrates

10.1063/1.364155

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

The combination of a low loss, high-Tc superconductor and a polarizable dielectric looks interesting from the point of tunable, high Q filters for cellular communication. Epitaxial heterostructures of YBa2Cu3O7−∂/SrTiO3/YBa2Cu3O7−∂/CeO2 and SrTiO3/YBa2Cu3O7−∂/CeO2 were grown on sapphire substrates in this study. Superconducting transition temperatures of 88–90 K and a critical current density of about 2×106 A/cm2 at 77 K were determined for YBa2Cu3O7−∂ films on CeO2 buffered sapphire. An effective permittivity of 340 at 300 K was measured capacitively for the SrTiO3 layer between YBa2Cu3O7−∂ electrodes; it increased three times at 50 K. The dielectric constant of SrTiO3 was observed to decrease a factor of 2 as a dc bias voltage of ±2.5 V was applied between the electrodes. Much smaller nonlinearities and temperature dependences of the dielectric constant were noted if the top YBa2Cu3O7−∂ electrode was replaced by an Ag one.

Bibliography

Boikov, Yu. A., & Claeson, T. (1997). High tunability of the permittivity of YBa2Cu3O7ââ/SrTiO3 heterostructures on sapphire substrates. Journal of Applied Physics, 81(7), 3232â3236.

Authors 2

Yu. A. Boikov (first)
T. Claeson (additional)

References 21 Referenced 41

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Dates

Type	When
Created	23 years ago (July 26, 2002, 9:52 a.m.)
Deposited	1 year, 6 months ago (Feb. 2, 2024, 2:38 p.m.)
Indexed	4 months ago (April 20, 2025, 12:42 a.m.)
Issued	28 years, 4 months ago (April 1, 1997)
Published	28 years, 4 months ago (April 1, 1997)
Published Print	28 years, 4 months ago (April 1, 1997)

Funders 0

None

BibTeX

@article{Boikov_1997, title={High tunability of the permittivity of YBa2Cu3O7−∂/SrTiO3 heterostructures on sapphire substrates}, volume={81}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.364155}, DOI={10.1063/1.364155}, number={7}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Boikov, Yu. A. and Claeson, T.}, year={1997}, month=apr, pages={3232–3236} }

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