cff-version: 1.2.0
abstract: "<p>Low-loss deposited dielectrics will benefit superconducting devices such as integrated superconducting spectrometers, superconducting qubits and kinetic inductance parametric amplifiers. Compared with planar structures, multi-layer structures such as microstrips are more compact and eliminate radiation loss at high frequencies. Multi-layer structures are most easily fabricated with deposited dielectrics, which typically exhibit higher dielectric loss than crystalline dielectrics. We measured the sub-kelvin and low-power microwave and mm-submm wave dielectric loss of hydrogenated amorphous silicon carbide (a-SiC:H), using a superconducting chip with NbTiN/a-SiC:H/NbTiN microstrip resonators. We deposited the a-SiC:H by plasma-enhanced chemical vapor deposition at a substrate temperature of 400°C. The a-SiC:H has a mm-submm loss tangent ranging from&nbsp;0.80±0.01×10^−4 to&nbsp;1.43±0.04×10&amp;−4 in the range of 270 to 385 GHz. The microwave loss tangent is&nbsp;3.2±0.2×10^−5. These are the lowest low-power sub-kelvin loss tangents that have been reported for microstrip resonators at mm-submm and microwave frequencies. We observe that the loss tangent increases with frequency. The a-SiC:H films are free of blisters and have low stress:&nbsp;−20 MPa compressive at 200 nm thickness to 60 MPa tensile at 1000 nm thickness.</p>"
authors:
  - family-names: Buijtendorp
    given-names: Bruno
title: "Data  underlying the publication: Hydrogenated Amorphous Silicon Carbide: A Low-Loss Deposited Dielectric for Microwave to Submillimeter-Wave Superconducting Circuits"
keywords:
version: 1
identifiers:
  - type: doi
    value: 10.4121/32a6e927-7e75-4cc9-a8f4-df360c3ef2ab.v1
license: CC0
date-released: 2024-10-25