17–21 Aug 2017
AlbaNova
Europe/Stockholm timezone

Jeremy Levy - Intrinsic One-Dimensional Nature of Pairing and Supercon- ductivity at the LaAlO/SrTiO Interface

19 Aug 2017, 09:00
35m
FB52 (AlbaNova)

FB52

AlbaNova

Description

$SrTiO_3$ is a superconducting semiconductor whose pairing mechanism has remained mysterious for more than half a century. The development of $SrTiO_3$-based heterostructures and nanostructures has enabled systematic investigation of the role of dimensionality on superconducting behavior. Here, we examine superconductivity in a family of $LaAlO_3/SrTiO_3$ channels whose widths systematically traverse the 1D-2D transition. The superconducting critical current of $LaAlO_3/SrTiO_3$ is found to be independent of width ranging from 10-1000 nm; the narrower channels exhibit densities that are at least an order of magnitude larger than for macroscopic 2D $LaAlO_3/SrTiO_3$ interfaces. Increasing the number of 1D channels results in a marked increase in critical current and suppression of background resistance. Resistive anomalies outside of the superconducting regime are observed for the narrow channels, and are attributed to a state in which electrons are paired but not superconducting. These results strongly indicate that electron pairing?and superconductivity?exist only along the boundaries of these channels and are absent within the interior region of the channels. These experiments provide new physical constraints on possible pairing mechanisms for $SrTiO_3$-based systems.

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