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Molybdenum-rhenium superconducting suspended nanostructures
9. N. Tombros, A. Veligura, J. Junesch, J. J. van den Berg, P. J. Zomer, M. Wojtaszek, I. J. V. Marun, H. T. Jonkman, and B. J. van Wees, J. Appl. Phys. 109, 093702 (2011).
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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
have a critical temperature of
, which can increase by 0.5 K upon annealing at
. A detailed study of the dependence of the superconducting
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
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