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Superconducting boron doped nanocrystalline diamond microwave coplanar resonator

Cuenca, Jerome A. ORCID:, Brien, Thomas, Mandal, Soumen ORCID:, Manifold, Scott, Doyle, Simon ORCID:, Porch, Adrian ORCID:, Klemencic, Georgina M. ORCID: and Williams, Oliver A. ORCID: 2023. Superconducting boron doped nanocrystalline diamond microwave coplanar resonator. Carbon 201 , pp. 251-259. 10.1016/j.carbon.2022.08.084

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A coplanar waveguide resonator (CPR) is presented for kinetic inductance () and penetration depth () measurements of superconducting boron doped nanocrystalline diamond (B-NCD) at microwave frequencies of 0.4 to 1.2 GHz and at temperatures below 3 K. Using finite element modelling and experimental measurements, this work demonstrates that thin granular B-NCD films (thickness 500 nm) on Si have a large penetration depth (3.8 μm), and therefore an associated high kinetic inductance per square ( 670 to 690 pH/). These values are much larger than those typically obtained for films on single crystal diamond, which is likely due to the high granularity of the nanocrystalline films. Based on the measured Q factors of the structure, the calculated surface resistance is found to be around 1 to 6 μΩ at K in the 0.4 to 1.2 GHz range, demonstrating the potential for granular B-NCD for high quality factor superconducting microwave resonators and highly sensitive kinetic inductance detectors.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Physics and Astronomy
Publisher: Elsevier
ISSN: 0008-6223
Funders: EPSRC
Date of First Compliant Deposit: 22 September 2022
Date of Acceptance: 28 August 2022
Last Modified: 15 Jun 2023 02:33

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