Synthesis of Metastable Ruddlesden–Popper Titanates, (ATiO₃)_nAO, with n ≥ 20 by Molecular-Beam Epitaxy

Authors

Matthew R. Barone, Cornell University
Myoungho Jeong, Samsung Electronics
Nicholas Parker, Boise State University
Jiaxin Sun, Cornell University
Dmitri A. Tenne, Boise State UniversityFollow
Kiyoung Lee, Samsung Electronics
Darrell G. Schlom, Cornell University

Document Type

Article

Publication Date

9-2022

Abstract

We outline a method to synthesize (ATiO₃)_nAO Ruddlesden–Popper phases with high-n, where the A-site is a mixture of barium and strontium, by molecular-beam epitaxy. The precision and consistency of the method described is demonstrated by the growth of an unprecedented (SrTiO₃)₅₀SrO epitaxial film. We proceed to investigate barium incorporation into the Ruddlesden–Popper structure, which is limited to a few percent in bulk, and we find that the amount of barium that can be incorporated depends on both the substrate temperature and the strain state of the film. At the optimal growth temperature, we demonstrate that as much as 33% barium can homogeneously populate the A-site when films are grown on SrTiO₃ (001) substrates, whereas up to 60% barium can be accommodated in films grown on TbScO₃ (110) substrates, which we attribute to the difference in strain. This detailed synthetic study of high n, metastable Ruddlesden–Popper phases is pertinent to a variety of fields from quantum materials to tunable dielectrics.

Copyright Statement

Copyright 2022 Author(s). This article is distributed under a Creative Commons Attribution (CC BY) License.

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Publication Information

Barone, Matthew R.; Jeong, Myoungho; Parker, Nicholas; Sun, Jiaxin; Tenne, Dmitri A.; Lee, Kiyoung; and Schlom, Darrell G.. (2022). "Synthesis of Metastable Ruddlesden–Popper Titanates, (ATiO₃)_nAO, with n ≥ 20 by Molecular-Beam Epitaxy". APL Materials, 10(9), 091106. https://doi.org/10.1063/5.0101202