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Single-Mode Superconductivity in LaAlO3/SrTiO3 Nanostructures

Published online by Cambridge University Press:  10 April 2013

Joshua P. Veazey ,
Guanglei Cheng ,
Patrick Irvin ,
Shicheng Lu ,
Mengchen Huang ,
Feng Bi ,
Chung-Wung Bark ,
Sangwoo Ryu ,
Kwang-Hwan Cho  and
Chang-Beom Eom
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Joshua P. Veazey
Affiliation:
University of Pittsburgh, Pittsburgh, PA 15260, U.S.A.
Guanglei Cheng
Affiliation:
University of Pittsburgh, Pittsburgh, PA 15260, U.S.A.
Patrick Irvin
Affiliation:
University of Pittsburgh, Pittsburgh, PA 15260, U.S.A.
Shicheng Lu
Affiliation:
University of Pittsburgh, Pittsburgh, PA 15260, U.S.A.
Mengchen Huang
Affiliation:
University of Pittsburgh, Pittsburgh, PA 15260, U.S.A.
Feng Bi
Affiliation:
University of Pittsburgh, Pittsburgh, PA 15260, U.S.A.
Chung-Wung Bark
Affiliation:
University of Wisconsin-Madison,Madison, WI 53706, U.S.A.
Sangwoo Ryu
Affiliation:
University of Wisconsin-Madison,Madison, WI 53706, U.S.A.
Kwang-Hwan Cho
Affiliation:
University of Wisconsin-Madison,Madison, WI 53706, U.S.A.
Chang-Beom Eom
Affiliation:
University of Wisconsin-Madison,Madison, WI 53706, U.S.A.
Jeremy Levy
Affiliation:
University of Pittsburgh, Pittsburgh, PA 15260, U.S.A.
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Abstract

The properties of superconductors at the extreme limits of dimensionality are of fundamental interest. The interface of LaAlO3 and SrTiO3 hosts a quasi-two-dimensional superconductor below Tc≈200 mK. Here we report superconductivity in nanowire-shaped structures created at the LaAlO3/SrTiO3 interface using conductive atomic force microscope lithography. Nanowire cross-sections are small compared to the superconducting coherence length in LaAlO3/SrTiO3 (w <<ξSC∼100 nm), placing them in the quasi-1D regime. The ability to “write” fully superconducting nanostructures on an insulating LaAlO3/SrTiO3 “canvas” opens possibilities for the development of new families of superconducting nanoelectronics. Four-terminal transport measurements suggest that in some devices both the normal and superconducting states are confined to a single quantum channel.

Keywords

oxidesuperconductingnanostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1507: Symposium AA – Oxide Nanoelectronics and Multifunctional Dielectrics , 2013 , mrsf12-1507-aa05-05
Copyright
Copyright © Materials Research Society 2013

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