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Scientific article
Open access
English

Quantum paraelectricity probed by superconducting resonators

Published inPhysical review. B., vol. 95, no. 21, 214513
Publication date2017-06-28
First online date2017-06-28
Abstract

Superconducting coplanar waveguide (CPW) resonators are powerful and versatile tools used in areas ranging from radiation detection to circuit quantum electrodynamics. Their potential for low intrinsic losses makes them attractive as sensitive probes of electronic properties of bulk materials and thin films. Here we use superconducting MoRe CPW resonators to investigate the high-frequency (up to 0.3 GHz) and low-temperature (down to 3.5 K) permittivity of SrTiO3, a nonlinear dielectric on the verge of a ferroelectric transition (quantum paraelectricity). We perform a quantitative analysis of its dielectric properties as a function of external dc bias (up to ±15 V), rf power, and mode number and discuss our results within the framework of the most recent theoretical models. We also discuss the origin of a fatigue effect that reduces the tunability of the dielectric constant of SrTiO3, which we relate to the presence of oxygen vacancies.

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Affiliation Not a UNIGE publication
Research group
Funding
  • European Commission - Designer Quantum Materials Out of Equilibrium [677458]
Citation (ISO format)
DAVIDOVIKJ, D. et al. Quantum paraelectricity probed by superconducting resonators. In: Physical review. B., 2017, vol. 95, n° 21, p. 214513. doi: 10.1103/PhysRevB.95.214513
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ISSN of the journal2469-9950
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