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Reduced Nonlinear Microwave Effects in YBaCuO Resonators on a Polarized \hbox {SrTiO}_{3} Thin Layer

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6 Author(s)
Seron, D. ; Dept. of Signal Theor. & Commun., Polytech. Univ. of Catalonia, Barcelona, Spain ; Guyard, S. ; Bouzehouane, Karim ; Lemaitre, Y.
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The combination of oxides may yield the elaboration of heterostructures with new or multifunctional properties. With such a philosophy, YBaCuO superconducting thin films were grown on top of a thin SrTiO3 paraelectric layer to observe the interaction between their respective microwave nonlinearities. The SrTiO3 layer was characterized by measuring the quality factor (Q 0) of slot meander line resonators at 6 GHz and 77 K. DC biasing the paraelectric significantly improves the resonator linear and nonlinear response. This paper shows how the saturation of the nonlinear dielectric constant(epsivr) and loss tangent (tandelta) in the paraelectric reduces the nonlinearities.

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Applied Superconductivity, IEEE Transactions on  (Volume:19 ,  Issue: 6 )