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Microwave characterization of superconducting coplanar resonators made out of granular aluminium

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arxiv 2508.03873 v1 pith:456E4BVI submitted 2025-08-05 cond-mat.supr-con cond-mat.mtrl-sci

Microwave characterization of superconducting coplanar resonators made out of granular aluminium

classification cond-mat.supr-con cond-mat.mtrl-sci
keywords resonatorsaluminiumgranularmicrowavecharacterizationfilmsfunctionmade
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We have designed, fabricated and characterized microwave resonators made out of thin films of granular aluminium (grAl) with different oxygen content. We extract the contribution of the large kinetic-inductance of this disordered superconductor from the frequency shift of the resonators as a function of temperature, and discuss the correlation with the resistivity of the films. At low temperatures, measurements of the internal quality factor as a function of microwave power indicate the presence of two-level systems, which are inherent to the growth process of the granular aluminium. The characterization methods presented here may be useful for the design of MKIDs, high-impedance resonators and superinductors.

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