Correlated Non-Gaussian phase fluctuations in LaAlO${}_3$/SrTiO${}_3$ heterointerface

Abstract

We probe the existence of large correlated non-Gaussian phase fluctuations in the vicinity of the superconducting phase transition in the conducting layer residing at the interface of LaAlO${}_3$/SrTiO${}_3$ heterostructures. The non-Gaussian fluctuations appear between the Berezinskii-Kosterlitz-Thouless transition temperature $T_{BKT}$ and the mean field transition temperature $T_C$. Subsequent theoretical analysis reveals that non-Gaussianity arises predominantly due to the percolative transition of a Josephson coupled network of superconductors. Our results confirm that the superconductivity in this system is confined to two-dimensions. Our study of the non-Gaussian resistance fluctuation spectrum provides a novel means to explore the BKT-transition in two-dimensional inhomogeneous superconductors.

10 pages, 12 figures

References in corpus (4)

• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Nature of the superconductor-insulator transition in disordered superconductors
• Enhanced spin-orbit coupling and charge carrier density suppression in LaAl1-xCrxO3/SrTiO3 heterointerfaces
• Probing a spin-glass state in SrRuO3 thin films through higher-order statistics of resistance fluctuations

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• Persistence of the Berezinskii-Kosterlitz-Thouless transition with long-range couplings