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Title: Creating Ruddlesden-Popper phases by hybrid molecular beam epitaxy

Abstract

The synthesis of a 50 unit cell thick n = 4 Sr{sub n+1}Ti{sub n}O{sub 3n+1} (Sr{sub 5}Ti{sub 4}O{sub 13}) Ruddlesden-Popper (RP) phase film is demonstrated by sequentially depositing SrO and TiO{sub 2} layers in an alternating fashion using hybrid molecular beam epitaxy (MBE), where Ti was supplied using titanium tetraisopropoxide (TTIP). A detailed calibration procedure is outlined for determining the shuttering times to deposit SrO and TiO{sub 2} layers with precise monolayer doses using in-situ reflection high energy electron diffraction (RHEED) as feedback. Using optimized Sr and TTIP shuttering times, a fully automated growth of the n = 4 RP phase was carried out over a period of >4.5 h. Very stable RHEED intensity oscillations were observed over the entire growth period. The structural characterization by X-ray diffraction and high resolution transmission electron microscopy revealed that a constant periodicity of four SrTiO{sub 3} perovskite unit cell blocks separating the double SrO rocksalt layer was maintained throughout the entire film thickness with a very little amount of planar faults oriented perpendicular to the growth front direction. These results illustrate that hybrid MBE is capable of layer-by-layer growth with atomic level precision and excellent flux stability.

Authors:
; ; ;  [1]
  1. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
Publication Date:
OSTI Identifier:
22594446
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 109; Journal Issue: 4; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CALIBRATION; DEPOSITS; ELECTRON DIFFRACTION; FILMS; LAYERS; MOLECULAR BEAM EPITAXY; MOLECULAR BEAMS; NITRATES; PERIODICITY; PEROVSKITE; REFLECTION; SHUTTERS; STRONTIUM OXIDES; STRONTIUM TITANATES; THICKNESS; TITANIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION

Citation Formats

Haislmaier, Ryan C., Stone, Greg, Alem, Nasim, and Engel-Herbert, Roman, E-mail: rue2@psu.edu. Creating Ruddlesden-Popper phases by hybrid molecular beam epitaxy. United States: N. p., 2016. Web. doi:10.1063/1.4959180.
Haislmaier, Ryan C., Stone, Greg, Alem, Nasim, & Engel-Herbert, Roman, E-mail: rue2@psu.edu. Creating Ruddlesden-Popper phases by hybrid molecular beam epitaxy. United States. doi:10.1063/1.4959180.
Haislmaier, Ryan C., Stone, Greg, Alem, Nasim, and Engel-Herbert, Roman, E-mail: rue2@psu.edu. Mon . "Creating Ruddlesden-Popper phases by hybrid molecular beam epitaxy". United States. doi:10.1063/1.4959180.
@article{osti_22594446,
title = {Creating Ruddlesden-Popper phases by hybrid molecular beam epitaxy},
author = {Haislmaier, Ryan C. and Stone, Greg and Alem, Nasim and Engel-Herbert, Roman, E-mail: rue2@psu.edu},
abstractNote = {The synthesis of a 50 unit cell thick n = 4 Sr{sub n+1}Ti{sub n}O{sub 3n+1} (Sr{sub 5}Ti{sub 4}O{sub 13}) Ruddlesden-Popper (RP) phase film is demonstrated by sequentially depositing SrO and TiO{sub 2} layers in an alternating fashion using hybrid molecular beam epitaxy (MBE), where Ti was supplied using titanium tetraisopropoxide (TTIP). A detailed calibration procedure is outlined for determining the shuttering times to deposit SrO and TiO{sub 2} layers with precise monolayer doses using in-situ reflection high energy electron diffraction (RHEED) as feedback. Using optimized Sr and TTIP shuttering times, a fully automated growth of the n = 4 RP phase was carried out over a period of >4.5 h. Very stable RHEED intensity oscillations were observed over the entire growth period. The structural characterization by X-ray diffraction and high resolution transmission electron microscopy revealed that a constant periodicity of four SrTiO{sub 3} perovskite unit cell blocks separating the double SrO rocksalt layer was maintained throughout the entire film thickness with a very little amount of planar faults oriented perpendicular to the growth front direction. These results illustrate that hybrid MBE is capable of layer-by-layer growth with atomic level precision and excellent flux stability.},
doi = {10.1063/1.4959180},
journal = {Applied Physics Letters},
number = 4,
volume = 109,
place = {United States},
year = {Mon Jul 25 00:00:00 EDT 2016},
month = {Mon Jul 25 00:00:00 EDT 2016}
}