Conducting interfaces between band insulating oxides: the LaGaO3/SrTiO3

TL;DR

This paper demonstrates that LaGaO3/SrTiO3 heterostructures form highly conductive interfaces with potential for tailored electronic properties, expanding the understanding of polar-non polar oxide interfaces.

Contribution

It provides detailed analysis of LaGaO3/SrTiO3 interfaces, revealing their high conductivity and superconductivity, and discusses their potential for future material engineering.

Findings

High conductivity at LaGaO3/SrTiO3 interface

Observation of superconducting transition

Comparison with LaAlO3/SrTiO3 results

Abstract

We show that the growth of the heterostructure LaGaO3/SrTiO3 yields the formation of a highly conductive interface. Our samples were carefully analyzed by high resolution electron microscopy, in order to assess their crystal perfection and to evaluate the abruptness of the interface. Their carrier density and sheet resistance are compared to the case of LaAlO3/SrTiO3 and a superconducting transition is found. The results open the route to widening the field of polar-non polar interfaces, pose some phenomenological constrains to their underlying physics and highlight the chance of tailoring their properties for future applications by adopting suitable polar materials.