Two-Dimensional Superconductivity at the LaAlO3/KTaO3(110) Heterointerface

We report on the observation of a T-c similar to 0.9 K superconductivity at the interface between LaAlO3 film and the 5d transition metal oxide KTaO3(110) single crystal. The interface shows a large anisotropy of the upper critical field, and its superconducting transition is consistent with a Berezinskii-Kosterlitz-Thouless transition. Both facts suggest that the superconductivity is two-dimensional (2D) in nature. The carrier density measured at 5 K is similar to 7 x 10(13) cm(-2). The superconducting layer thickness and coherence length are estimated to be similar to 8 and similar to 30 nm, respectively. Our result provides a new platform for the study of 2D superconductivity at oxide interfaces.

Automated summary

This report discusses the observation of superconductivity at the interface between LaAlO3 film and KTaO3 single crystal, suggesting a two-dimensional nature. The study provides estimates for carrier density, superconducting layer thickness, and coherence length.