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Title: Overlapping growth windows to build complex oxide superlattices

Abstract

Perovskite oxide superlattices are of particular interest due to novel phenomena emerging at interfaces which are beyond the bulk properties of the constituent layers. However, building perovskite superlattices comprised of stoichiometric layers with sharp interfaces has proven challenging. Here, the synthesis of a series of high quality (SrTiO3)n/(CaTiO3)n superlattice structures grown on LSAT substrates is demonstrated by employing hybrid molecular beam epitaxy, where Ti was supplied using metal-organic titanium tetraisopropoxide (TTIP), and Sr and Ca were supplied using conventional effusion cells. By careful adjustment of the cation fluxes of Sr and Ca with respect to the TTIP flux, the growth windows of SrTiO3 and CaTiO3 were overlapped, allowing us to grow the individual superlattice layers with self-regulated stoichiometry. Stable and repeatable reflection high-energy electron diffraction oscillations during the entire ~2.5 h growth period indicated good source flux stability. The structural quality of the superlattice films were determined by scanning transmission electron microscopy and synchrotron-based X-ray diffraction, revealing periodic, phase pure, homogenous superlattice structures with abrupt interfaces. Application of perovskite stoichiometric growth windows offers great potential for accessing and realizing interface driven phenomena in versatile perovskite superlattice materials with chemistries beyond titanates.

Authors:
 [1];  [1];  [1]; ORCiD logo [1];  [2];  [3];  [1];  [1]
+ Show Author Affiliations
  1. Pennsylvania State Univ., University Park, PA (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Science and Technology of China, Hefei (China)
  3. Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, USA
Publication Date:
Research Org.:
Argonne National Lab.(ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1503284
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
APL Materials
Additional Journal Information:
Journal Volume: 6; Journal Issue: 11; Journal ID: ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Haislmaier, Ryan C., Lapano, Jason, Yuan, Yakun, Stone, Greg, Dong, Yongqi, Zhou, Hua, Alem, Nasim, and Engel-Herbert, Roman. Overlapping growth windows to build complex oxide superlattices. United States: N. p., 2018. Web. doi:10.1063/1.5061778.
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Haislmaier, Ryan C., Lapano, Jason, Yuan, Yakun, Stone, Greg, Dong, Yongqi, Zhou, Hua, Alem, Nasim, & Engel-Herbert, Roman. Overlapping growth windows to build complex oxide superlattices. United States. https://doi.org/10.1063/1.5061778
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Haislmaier, Ryan C., Lapano, Jason, Yuan, Yakun, Stone, Greg, Dong, Yongqi, Zhou, Hua, Alem, Nasim, and Engel-Herbert, Roman. Thu . "Overlapping growth windows to build complex oxide superlattices". United States. https://doi.org/10.1063/1.5061778. https://www.osti.gov/servlets/purl/1503284.
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@article{osti_1503284,
title = {Overlapping growth windows to build complex oxide superlattices},
author = {Haislmaier, Ryan C. and Lapano, Jason and Yuan, Yakun and Stone, Greg and Dong, Yongqi and Zhou, Hua and Alem, Nasim and Engel-Herbert, Roman},
abstractNote = {Perovskite oxide superlattices are of particular interest due to novel phenomena emerging at interfaces which are beyond the bulk properties of the constituent layers. However, building perovskite superlattices comprised of stoichiometric layers with sharp interfaces has proven challenging. Here, the synthesis of a series of high quality (SrTiO3)n/(CaTiO3)n superlattice structures grown on LSAT substrates is demonstrated by employing hybrid molecular beam epitaxy, where Ti was supplied using metal-organic titanium tetraisopropoxide (TTIP), and Sr and Ca were supplied using conventional effusion cells. By careful adjustment of the cation fluxes of Sr and Ca with respect to the TTIP flux, the growth windows of SrTiO3 and CaTiO3 were overlapped, allowing us to grow the individual superlattice layers with self-regulated stoichiometry. Stable and repeatable reflection high-energy electron diffraction oscillations during the entire ~2.5 h growth period indicated good source flux stability. The structural quality of the superlattice films were determined by scanning transmission electron microscopy and synchrotron-based X-ray diffraction, revealing periodic, phase pure, homogenous superlattice structures with abrupt interfaces. Application of perovskite stoichiometric growth windows offers great potential for accessing and realizing interface driven phenomena in versatile perovskite superlattice materials with chemistries beyond titanates.},
doi = {10.1063/1.5061778},
journal = {APL Materials},
number = 11,
volume = 6,
place = {United States},
year = {Thu Nov 01 00:00:00 EDT 2018},
month = {Thu Nov 01 00:00:00 EDT 2018}
}
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https://doi.org/10.1063/1.5061778
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