Epitaxial heterostructures YBa2Cu3O7−δ/KTaO3 for microwave applications
- 30 October 1995
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 67 (18) , 2708-2710
- https://doi.org/10.1063/1.114300
Abstract
Combinations of high TC superconducting and ferroelectric films may give rise to tunable, high‐Q microwave components. c‐axis oriented YBa2Cu3O7−δ films were grown by laser ablation on (001) and vicinically cut KTaO3 substrates and studied by x‐ray diffraction and electron microscopy. Competitive superconducting properties were registered. YBa2Cu3O7−δ/KTaO3/YBa2Cu3O7−δ trilayers were deposited on silicon‐on‐sapphire buffered by CeO2/Y‐ZrO2. The dielectric permittivity of KTO3 at 15–100 K decreased considerably when the layer was polarized by a dc voltage. A loss factor tan δ=0.007 was measured at 100 kHz and T=50–100 K.Keywords
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