Co-sputtered MoRe thin films for carbon nanotube growth-compatible superconducting coplanar resonators

Abstract

Molybdenum rhenium alloy thin films can exhibit superconductivity up to critical temperatures of $T_c=15\mathrm{K}$. At the same time, the films are highly stable in the high-temperature methane / hydrogen atmosphere typically required to grow single wall carbon nanotubes. We characterize molybdenum rhenium alloy films deposited via simultaneous sputtering from two sources, with respect to their composition as function of sputter parameters and their electronic dc as well as GHz properties at low temperature. Specific emphasis is placed on the effect of the carbon nanotube growth conditions on the film. Superconducting coplanar waveguide resonators are defined lithographically; we demonstrate that the resonators remain functional when undergoing nanotube growth conditions, and characterize their properties as function of temperature. This paves the way for ultra-clean nanotube devices grown in situ onto superconducting coplanar waveguide circuit elements.

arXiv comment8 pages, 6 figures

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Cited by in corpus (6)

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• Quartz tuning-fork based carbon nanotube transfer into quantum device geometries
• Towards carbon nanotube growth into superconducting microwave resonator geometries
• Stepwise fabrication and optimization of coplanar waveguide resonator hybrid devices
• Fabrication and Characterization of Magnetic-Field-Resilient MoRe Superconducting Coplanar Waveguide Resonators
• From Transparent Conduction to Coulomb Blockade at Fixed Hole Number