Conductance variation in BaSnO₃/LaIn_xGa_1-xO₃ polar interface

We have reported that polar perovskite oxide LaInO₃ (LIO) and nonpolar perovskite oxide BaSnO₃ (BSO) forms a interface with high conductance [1, 2]. To identify the role of LIO in the conductance enhancement, we tested another interface between BSO and LaGaO₃ (LGO). Since LGO, a polar perovskite oxide like LIO, has its lattice constant of 3.9 Å, which is smaller than that of LIO, we expect to see the effect of the lattice constant change on the conductance enhancement. We first investigated epitaxial growth of LaIn_xGa_1-xO₃ (LIGO) on BaSnO₃ by x-ray diffraction measurement and transmission electron microscopy. The conductance of the LIGO/BSO interface was also measured before and after LIGO deposition at various Ga ratio. Based on the structure and electronic properties of the interface, we will discuss the influence of strain on the conductance enhancement.

[1] U. Kim et al., APL Mat. 3, 036101 (2015).
[2] U. Kim et al., APL Mat. 4, 071102 (2016).