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Growth of nanoscale BaTiO3/SrTiO3 superlattices by molecular-beam epitaxy

Published online by Cambridge University Press:  31 January 2011

A. Soukiassian ,
W. Tian ,
V. Vaithyanathan ,
J.H. Haeni ,
L.Q. Chen ,
X.X. Xi ,
D.G. Schlom ,
D.A. Tenne ,
H.P. Sun  and
X.Q. Pan
...Show all authors
A. Soukiassian*
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802-5005
W. Tian
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802-5005
V. Vaithyanathan
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802-5005
J.H. Haeni
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802-5005
L.Q. Chen
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802-5005
X.X. Xi
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802-5005
D.G. Schlom
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802-5005
D.A. Tenne
Affiliation:
Department of Physics, Boise State University, Boise, Idaho 83725
H.P. Sun
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109
X.Q. Pan
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109
K.J. Choi
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706
C.B. Eom
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706
Y.L. Li
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Q.X. Jia
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
C. Constantin
Affiliation:
Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
R.M. Feenstra
Affiliation:
Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
M. Bernhagen
Affiliation:
Institute for Crystal Growth, Max-Born-Straße 2, D-12489 Berlin, Germany
P. Reiche
Affiliation:
Institute for Crystal Growth, Max-Born-Straße 2, D-12489 Berlin, Germany
R. Uecker
Affiliation:
Institute for Crystal Growth, Max-Born-Straße 2, D-12489 Berlin, Germany
*
a)Address all correspondence to this author. e-mail: aqs11@psu.edu
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Abstract

Commensurate BaTiO3/SrTiO3 superlattices were grown by reactive molecular-beam epitaxy on four different substrates: TiO2-terminated (001) SrTiO3, (101) DyScO3, (101) GdScO3, and (101) SmScO3. With the aid of reflection high-energy electron diffraction (RHEED), precise single-monolayer doses of BaO, SrO, and TiO2 were deposited sequentially to create commensurate BaTiO3/SrTiO3 superlattices with a variety of periodicities. X-ray diffraction (XRD) measurements exhibit clear superlattice peaks at the expected positions. The rocking curve full width half-maximum of the superlattices was as narrow as 7 arc s (0.002°). High-resolution transmission electron microscopy reveals nearly atomically abrupt interfaces. Temperature-dependent ultraviolet Raman and XRD were used to reveal the paraelectric-to-ferroelectric transition temperature (TC). Our results demonstrate the importance of finite size and strain effects on the TC of BaTiO3/SrTiO3 superlattices. In addition to probing finite size and strain effects, these heterostructures may be relevant for novel phonon devices, including mirrors, filters, and cavities for coherent phonon generation and control.

Keywords

Molecular beam epitaxy (MBE)Thin filmFerroelectric
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 5 , May 2008 , pp. 1417 - 1432
Copyright
Copyright © Materials Research Society 2008

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References

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