Characterizing dielectric properties of ultra-thin films using superconducting coplanar microwave resonators.

  title={Characterizing dielectric properties of ultra-thin films using superconducting coplanar microwave resonators.},
  author={Nikolaj G. Ebensperger and Benedikt Ferdinand and Dieter Koelle and Reinhold Kleiner and Martin Dressel and Marc Scheffler},
  journal={The Review of scientific instruments},
  volume={90 11},
We present an experimental approach for cryogenic dielectric measurements on ultrathin insulating films. Based on a coplanar microwave waveguide design, we implement superconducting quarter-wave resonators with inductive coupling, which allows us to determine the real part ε1 of the dielectric function at gigahertz frequencies and sample thicknesses down to a few nanometers. We perform simulations to optimize resonator coupling and sensitivity, and we demonstrate the possibility to quantify ε1… 
Microwave probing of bulk dielectrics using superconducting coplanar resonators in distant-flip-chip geometry.
A technique to study the dielectric properties of bulk dielectrics at GHz frequencies by depositing a superconducting coplanar Nb resonator directly on the material of interest, and this resonator is probed in distant-flip-chip geometry with a microwave feedline on a separate chip.
Cryogenic frequency-domain electron spin resonance spectrometer based on coplanar waveguides and field modulation.
An instrument to perform frequency-domain electron spin resonance experiments that is based on coplanar waveguides and field modulation is presented and the comparison reveals the improved signal-to-noise ratio achieved by field modulation.
Phase fluctuations in conventional superconductors
  • P. Raychaudhuri, Surajit Dutta
  • Physics, Medicine
    Journal of physics. Condensed matter : an Institute of Physics journal
  • 2021
In this article, the recent experimental developments on the study of phase fluctuations in conventional superconductors are reviewed.


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