Frequency stable superconducting resonator with buffer layers

Farhat Abbas
1997 Review of Scientific Instruments  
The resonant frequency of a superconducting planar resonator is dependent on the material properties and thicknesses of the superconductors, the dielectric ͑substrate͒, and the buffer layers. In this article, we compute the first and second derivatives with respect to temperature of a wave velocity ratio ͑with respect to free space͒ for various combinations of material properties. The dependence of resonant frequency on the dielectric constant and thicknesses of the substrate and buffer layers
more » ... and buffer layers is discussed. An example of YBCO thin films on rutile with sapphire buffer layers was computed. From this example, it may be concluded that, if a turning point can be realized at T ϭ60 K and the temperature controlled to better than 0.1 mK, then frequency standards with stabilities of parts in 10 15 should be attainable.
doi:10.1063/1.1148325 fatcat:ypad4wj65jbvdenquyrsjherqu