Molybdenum-rhenium superconducting suspended nanostructures
Abstract
Suspended superconducting nanostructures of MoRe 50%/50% by weight are fabricated employing commonly used fabrication steps in micro- and nano-meter scale devices followed by wet-etching with Hydro-fluoric acid of a SiO2 sacrificial layer. Suspended superconducting channels as narrow as 50 nm and length 3 μ m have a critical temperature of ≈ 6.5 K , which can increase by 0.5 K upon annealing at 400 ° C . A detailed study of the dependence of the superconducting critical current and critical temperature upon annealing and in devices with different channel widths reveals that desorption of contaminants is responsible for the improved superconducting properties. These findings pave the way for the development of superconducting electromechanical devices using standard fabrication techniques.
- Publication:
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Applied Physics Letters
- Pub Date:
- June 2014
- DOI:
- 10.1063/1.4883115
- arXiv:
- arXiv:1406.0653
- Bibcode:
- 2014ApPhL.104w3102A
- Keywords:
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- Condensed Matter - Superconductivity
- E-Print:
- To appear on Applied Physics Letters