Anisotropic superconducting properties of nanowires at the LaAlO$_3$/SrTiO$_3$ (110) interface
ORAL
Abstract
Quasi-1D nanowires are created using conductive AFM (c-AFM) lithography\footnote{C. Cen \textit{et al.}, Nat. Mater. \textbf{7}, 298 (2008)} at the LaAlO$_3$/SrTiO$_3$ (110) interface along the (001) and (1$\bar{1}$0) crystallographic directions. The superconducting properties of nanowires were investigated under transport measurements with respect to the crystallography and orbital hierarchy. We observe anisotropic superconductivity where the upper critical magnetic field along the (001) and (1$\bar{1}$0) directions are markedly different with a superconducting dome that is shifted for the two orientations as a function of gate voltages. The superconducting dome shift can be explained by anisotropic band structures along the two different directions combined with the Lifshitz transition\footnote{A. Joshua \textit{et al.}, Nat. Commun. \textbf{3}, 1129 (2012)}.
*We gratefully acknowledge support for this work from NSF DMR-1124131 and DMR-1104191 (JL), AFOSR FA9550-12-1-0057 and FA9550-12-1-0268 (JL), ONR N00014-15-1-2847 (JL), CRP Award NRF-CRP 8-2011-06 and 10-2012-02 (TV, A) and NUS FRC R-144-000-346-11 (TV. A)
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