We report superconductivity in quasi-1D nanostructures created at the LaAlO3/SrTiO3 interface. Nanostructures having line widths w~10 nm are formed from the parent two-dimensional electron liquid using conductive atomic force microscope lithography. Nanowire cross-sections are small compared to the superconducting coherence length in LaAlO3/SrTiO3 (w<<xi~100 nm), placing them in the quasi-1D regime. Broad superconducting transitions with temperature and finite resistances in the superconducting state well below Tc~200 mK are observed. V-I curves show switching between the superconducting and normal states that are characteristic of superconducting nanowires. The four-terminal resistance in the superconducting state shows an unusual dependence on the current path, varying by as much as an order of magnitude.
@article{arxiv.1210.3606,
title = {Superconducting LaAlO3/SrTiO3 Nanowires},
author = {Joshua P. Veazey and Guanglei Cheng and Patrick Irvin and Cheng Cen and Daniela F. Bogorin and Feng Bi and Mengchen Huang and Chung-Wung Bark and Sangwoo Ryu and Kwang-Hwan Cho and Chang-Beom Eom and Jeremy Levy},
journal= {arXiv preprint arXiv:1210.3606},
year = {2017}
}