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arXiv · 1210.3606

Superconducting LaAlO3/SrTiO3 Nanowires

Joshua P. Veazey·Guanglei Cheng·Patrick Irvin·Cheng Cen·Daniela F. Bogorin·Feng Bi·Mengchen Huang·Chung-Wung Bark·Sangwoo Ryu·Kwang-Hwan Cho·Chang-Beom Eom·Jeremy Levy
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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.

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Joshua P. Veazey, Guanglei Cheng, Patrick Irvin, Cheng Cen, Daniela F. Bogorin, Feng Bi, Mengchen Huang, Chung-Wung Bark, Sangwoo Ryu, Kwang-Hwan Cho, Chang-Beom Eom, Jeremy Levy. 2012-10-12. Superconducting LaAlO3/SrTiO3 Nanowires. https://doi.org/10.1088/0957-4484/24/37/375201

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