Superconducting LaAlO3/SrTiO3 Nanowires

Abstract

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.

19 pages, 4 figures, 1 table

References in corpus (10)

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Cited by in corpus (9)

• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Nanoscale Phenomena in Oxide Heterostructures
• Tunable electron-electron interactions in LaAlO3/SrTiO3 nanostructures
• One-Dimensional Nature of Pairing and Superconductivity at the LaAlO${}_3$/SrTiO${}_3$ Interface
• Micrometer-scale ballistic transport of electron pairs in LaAlO3/SrTiO3 nanowires
• Nanoscale control of LaAlO3/SrTiO3 metal-insulator transition using ultra-low-voltage electron-beam lithography
• Electronic transport in sub-micrometric channels at the LaAlO${}_3$/SrTiO${}_3$ interface
• Domain wall nature of sketched LaAlO3/SrTiO3 nanowires
• A Milli-Kelvin Atomic Force Microscope Made of Glass