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 50nm and length 3μm have a critical temperature of ≈6.5K, which can increase by 0.5K 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 width 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.
@article{arxiv.1406.0653,
title = {Molybdenum-Rhenium superconducting suspended nanostructures},
author = {Mohsin Aziz and David Christopher Hudson and Saverio Russo},
journal= {arXiv preprint arXiv:1406.0653},
year = {2015}
}