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We report epitaxial growth and structures of SrFeO 2.5 (SFO) films on SrTiO 3 (STO) (001) and (111) substrates by pulsed-laser deposition. Reflection high-energy electron diffraction intensity oscillations were observed during the initial growth on both substrates, reflecting a layer-by-layer growth mode of the formula unit cell. It was found that the films were stabilized with a monoclinic structure that was derived from the original orthorhombic structure of bulk Brownmillerite. Using an X-ray reciprocal space mapping technique, in-plane domain structures and the orientation relationship were investigated. In addition, the impact of laser spot area on the epitaxial structures was studied. For the films grown on the (001) STO, the orientation relationship was robust against the change of the laser spot area: SFO(001)//STO(001) and SFO(100)//STO(100) for the out-of-plane and the in-plane, respectively, with the [001] axis tilted toward the 4-fold a- and b-axes by ∼1.4°, whereas nearly (111)-oriented films were obtained on the (111) STO, exhibiting a complicated manner of tilting that depended on laser spot area. The observed variation in tilting configurations can be understood in terms of possible atomic arrangements at the SFO/STO interface. These results present a guide to control the heteroepitaxial growth and structure of (111)-oriented noncubic perovskites. The epitaxial structures of SrFeO 2.5 films grown on SrTiO 3 (001) and (111) substrates by PLD are reported. A layer-by-layer growth mode was achieved in the initial stage on both substrates. The films were stabilized with a monoclinic structure, where we identified the in-plane domain structures and orientation relationship. Our study presents a guide to control the heteroepitaxy of (111)-oriented noncubic perovskites. Abstract
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Probing the wave function of shallow Li and Na donors in ZnO nanoparticles.
Serguei Orlinskii, Jan Schmidt, Pavel G. Baranov … (2004)
Electron paramagnetic resonance and electron nuclear double resonance (ENDOR) experiments on ZnO nanoparticles reveal the presence of shallow donors related to interstitial Li and Na atoms. The shallow character of the wave function is evidenced by the multitude of 67Zn ENDOR lines and further by the hyperfine interactions with the 7Li and 23Na nuclei that are much smaller than for atomic lithium and sodium. In the case of the Li-doped nanoparticles, an increase of the hyperfine interaction with the 7Li nucleus and with the 1H nuclei in the Zn(OH)(2) capping layer is observed when reducing the size of the nanoparticles. This effect is caused by the confinement of the shallow-donor 1s-type wave function that has a Bohr radius of about 1.5 nm, i.e., comparable to the dimension of the nanoparticles.
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Magnetism, charge order, and giant magnetoresistance in SrFeO(3-delta) single crystals.
A Lebon, Stuart Adler, A Maljuk … (2004)
The electronic and magnetic properties of SrFeO(3-delta) single crystals with controlled oxygen content (0< or =delta< or =0.19) have been studied systematically by susceptibility, transport, and spectroscopic techniques. An intimate correlation between the spin-charge ordering and the electronic transport behavior is found. Giant negative as well as positive magnetoresistance are observed.
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Nature
H Wynberg, E Meijer, J. W. Hummelen … (2007)
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Author and article information
Journal
Journal ID (nlm-ta): Cryst Growth Des
Journal ID (publisher-id): cg
Journal ID (coden): cgdefu
Title: Crystal Growth & Design
Publisher: American Chemical Society
ISSN (Print): 1528-7483
ISSN (Electronic): 1528-7505
Publication date (Electronic): 18 February 2010
Publication date (Print): 07 April 2010
Volume: 10
Issue: 4
Pages: 1725-1729
Affiliations
[† ]Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
Author notes
[* ]To whom correspondence should be addressed. Electronic mail: aohtomo@ 123456imr.tohoku.ac.jp .
Article
DOI: 10.1021/cg901355c
PMC ID: 2851191
PubMed ID: 20383295
SO-VID: 692627f9-f1f8-499e-8f18-f20774003392
Copyright © Copyright © 2010 American Chemical Society
License:
This is an open-access article distributed under the ACS AuthorChoice Terms & Conditions. Any use of this article, must conform to the terms of that license which are available at http://pubs.acs.org.
History
Date received : 30 October 2009
Date revision received : 04 February 2010
Date: 18 February 2010
Date: 07 April 2010
Categories
Subject: Article
Custom metadata
document-id-old-9 cg901355c
document-id-new-14 cg-2009-01355c
ccc-price
ScienceOpen disciplines: Materials technology
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ScienceOpen disciplines: Materials technology
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