Sub-monolayer nucleation and growth of complex oxide heterostructures at high supersaturation and rapid flux modulation

TL;DR

This study investigates the nanoscale growth kinetics of complex oxide heterostructures, revealing how high supersaturation and rapid flux modulation influence sub-monolayer nucleation and growth, crucial for synthesizing new oxide phases.

Contribution

It introduces a detailed analysis of the growth mechanisms of LaNiO3/LaAlO3 heterostructures under varied conditions, advancing understanding of sub-monolayer nucleation at high supersaturation.

Findings

High-quality multilayers with excellent crystallinity and surface morphology.

Growth behavior explained by a two-layer model considering temperature and flux.

Fundamental insights for synthesizing novel complex oxide phases.

Abstract

We report on the non-trivial nanoscale kinetics of the deposition of novel complex oxide heterostructures composed of a unit-cell thick correlated metal LaNiO3 and dielectric LaAlO3. The multilayers demonstrate exceptionally good crystallinity and surface morphology maintained over the large number of layers, as confirmed by AFM, RHEED, and synchrotron X-ray diffraction. To elucidate the physics behind the growth, the temperature of the substrate and the deposition rate were varied over a wide range and the results were treated in the framework of a two-layer model. These results are of fundamental importance for synthesis of new phases of complex oxide heterostructures.