Abstract
SrTiO 3 (STO) ferroelectric (FE) thin films associated with high temperature superconductors (HTSC) make a good compromise to realize electronically tunable microwave devices combining controllable dielectric properties of FE films with low loss microwave conductivity in HTSC. Up to now, STO thin films dedicated to this function were deposited by sputtering and pulsed laser deposition. In this study, we have explored the feasibility of tunable microwave devices made from STO thin films prepared by metalorganic chemical vapour deposition. We have characterized Au/STO/MgO coplanar waveguide structures to demonstrate tunability from 500 MHz to 35 GHz, in the 300 K to 60 K temperature range.
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