We have fabricated C-Ga-O nanowires by gallium focused ion beam-induced deposition from the carbon-based precursor phenanthrene. The electrical conductivity of the nanowires is weakly temperature dependent below 300 K, and indicates a transition to a superconducting state below Tc = 7 K. We have measured the temperature dependence of the upper critical field Hc2(T), and estimate a zero temperature critical field of 8.8 T. The Tc of this material is approximately 40% higher than that of any other direct write nanowire, such as those based on C-W-Ga, expanding the possibility of fabricating direct-write nanostructures that superconduct above liquid helium temperatures
@article{arxiv.1006.2173,
title = {Direct-write, focused ion beam-deposited,7 K superconducting C-Ga-O nanowire},
author = {Pashupati Dhakal and G. McMahon and T. Kirkpatrick and J. I. Oh and M. J. Naughton},
journal= {arXiv preprint arXiv:1006.2173},
year = {2015}
}