Unraveling interfacial strain and interfacial lattice reconstruction mechanism of ultrathin LaMnO3+δ layers in LaMnO3+δ/SrTiO3 superlattices

Understanding the interfacial lattice-reconstruction mechanism is a crucial step to purposely design functional oxide interfaces with emergent properties. Here we propose an approach using Poisson's ratio to determine the interfacial strain and unravel the underlying mechanism of lattice distor...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Journal of applied physics 2017-08, Vol.122 (8)
Hauptverfasser: Cao, Hui, Liu, Yang, Liang, Genhao, Zhao, Aidi, Zhai, Xiaofang
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Understanding the interfacial lattice-reconstruction mechanism is a crucial step to purposely design functional oxide interfaces with emergent properties. Here we propose an approach using Poisson's ratio to determine the interfacial strain and unravel the underlying mechanism of lattice distortions of ultrathin LaMnO3+δ layers interposed in short period (LaMnO3+δ)N/(SrTiO3)N(2) superlattices. The lattice structure of a virtual bulk, with identical stoichiometry to the LaMnO3+δ interfacial layer, was derived using Poisson's ratio. Thus the quantitative biaxial strain and the hydrostatic strain were obtained. Moreover, we found that changes of octahedral rotations along the in-plane and out-of-plane directions are roughly compensated, and the average rotation angle is always close to that of the virtual bulk. The study demonstrates the importance of using Poisson's ratio to understand the lattice reconstruction mechanism near oxides' interface.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4998958