Reflection High-Energy Electron Diffraction

Ichimiya, Ayahiko; Cohen, P. I.

doi:10.1017/cbo9780511735097

Cited by 268 publications

(254 citation statements)

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“…As seen in Fig. 1(b), the streak pattern observed along the Laue circles and the strongly developed Kikuchi lines clearly exclude the possibility of faceted morphology of the bare LAO (111) substrate 23 . Furthermore, as seen in Fig.…”

mentioning

confidence: 65%

Epitaxial growth of (111)-oriented LaAlO3/LaNiO3 ultra-thin superlattices

Middey

Meyers

Kareev

et al. 2012

Applied Physics Letters

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The epitaxial stabilization of a single layer or superlattice structures composed of complex oxide materials on polar (111) surfaces is severely burdened by reconstructions at the interface, that commonly arise to neutralize the polarity. We report on the synthesis of high quality LaNiO 3 /mLaAlO 3 pseudo cubic (111) superlattices on polar (111)-oriented LaAlO 3 , the proposed complex oxide candidate for a topological insulating behavior. Comprehensive X-Ray diffraction measurements, RHEED, and element specific resonant X-ray absorption spectroscopy affirm their high structural and chemical quality. The study offers an opportunity to fabricate interesting interface and topology controlled (111) oriented superlattices based on ortho-nickelates.Over the past few years, complex oxide superlattices (SL) with correlated carriers have been widely studied owing to the range of exciting phenomena emerging at the interface which are unattainable in the bulk constituents. 1,2 Recently, active experimental investigations 3-7 on the class of SLs consisting of paramagnetic metal LaNiO 3 (LNO) and LaAlO 3 (LAO) were initiated after the prediction of a possible high T c superconductivity in the LaNiO 3 /LaM O 3 heterostructures (where LaM O 3 is a wide band-gap insulator). 8,9 The experimental realization of LNO/LAO SLs grown on a (001) 10 surface of SrTiO 3 (STO), however, revealed the presence of an unexpected transition to Mott insulating ground state with antiferromagnetic order due to quantum confinement and the effect of d-orbital polarization by the interface. 4,6 Inspired by this approach, several recent theory proposals have been put forward regarding the physics which may emerge in a bilayer of LaNiO 3 sandwiched between LaAlO 3 layers grown along the [111] crystallographic direction. Specifically, the theory predicts the appearance of exotic topological phases (e.g. Dirac half-semimetal phase, quantum anomalous Hall insulator phase or ferromagnetic nematic phase) modulated by the strength of electron-electron correlations. CaTiO 3 on LAO, the epitaxial stabilization is possible only if a "screening" buffer layer is grown first on the polar surface. 18 On the other hand, the polarity matching at the interface can have strong influence on the epitaxial growth, defects formation and overall stoichiometry of the layers as observed by the marked interfacial electronic reconstruction for polar LNO film grown on the top of charge neutral STO vs. polar LAO (001) surface. 19 In this letter, we present the results of artificial layerby-layer growth of an unique class of (111)-oriented 2LNO/mLAO heterostructures (with m = 2, 3, and 4 unit cells) on LAO (111) single crystal (see Fig. 1(a)). The LAO substrate was selected to eliminate the effects of lattice mismatch (i.e. strain) between the layers, which otherwise may hinder the quality of growth. The extensive characterization using reflection high energy electron diffraction (RHEED), atomic force microscopy (AFM), X-ray diffraction (XRD), and synchrotron based resonant X-ray ...

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mentioning

confidence: 65%

Epitaxial growth of (111)-oriented LaAlO3/LaNiO3 ultra-thin superlattices

Middey

Meyers

Kareev

et al. 2012

Applied Physics Letters

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“…[7,14]. Fig.2 (d-f) shows that growth of Cu 2 O on MgO (1 1 0) starts in the Volmer-Weber or island regime, and the islands eventually merge to form a smooth and continuous film with some surface disorder as evidenced by the streaky nature of the pattern [15]. Note that the RHEED pattern corresponds to only a single orientation of the film, which indicates that nucleation of the second orientation is not spatially uniform and most likely predominates away from the center of the sample.…”

Section: Growth Using Pure Oxygen Plasmamentioning

confidence: 96%

Single phase, single orientation Cu2O (1 0 0) and (1 1 0) thin films grown by plasma-assisted molecular beam epitaxy

Tolstova

Wilson

Atwater

2015

Journal of Crystal Growth

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractEpitaxial growth of cuprous oxide (Cu 2 O) has been achieved on (1 0 0) and (1 1 0) orientations of MgO by plasma-assisted molecular beam epitaxy. Growth was investigated using a pure oxygen plasma as well as a 90%Ar/10%O 2 plasma. Cu 2 O films grown using pure oxygen on MgO (1 0 0) have a limited growth window and typically exhibit multiple phases and orientations. Films grown on MgO (1 1 0) using pure oxygen are phase stable and predominantly (1 1 0) oriented, with some (2 0 0) orientation present. Films grown using an Ar/O 2 plasma on MgO (1 0 0) have improved phase stability and a single (1 1 0) orientation. Growth on MgO (1 1 0) using an Ar/O 2 plasma yields highly reproducible (1 1 0) oriented single phase Cu 2 O films with a much wider growth window, suggesting that this substrate orientation is preferable for Cu 2 O phase stability.

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“…However, CAICISS requires samples with relatively large dimensions. Compared with these methods, reflection high-energy electron diffraction (RHEED) [7] is a simple technique. We can obtain RHEED patterns during crystal growth.…”

Section: Introductionmentioning

confidence: 99%

Auger Intensity Anomalies from ZnO(0001) Surface Excited by RHEED Incident Beam

Horio

Takakuwa

Ogawa

et al. 2016

e-J. Surf. Sci. Nanotech.

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Anomalous behaviors of Auger intensities have been observed for ZnO(0001) surface depending on the glancing angle of incident electron beam of RHEED. In the beam rocking Auger electron spectroscopy, BRAES, the profiles of Zn(LMM) and O(KLL) were compared with each other. It was found that their profiles differed in some aspects. This suggests that their Auger intensities are influenced by the wave field of incident electron beam of RHEED. In this study, RHEED rocking curves were also measured and analyzed by dynamical calculations. It has been found that the determination of surface polarity is possible by RHEED rocking curves.

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Reflection High-Energy Electron Diffraction

Cited by 268 publications

References 0 publications

Epitaxial growth of (111)-oriented LaAlO3/LaNiO3 ultra-thin superlattices

Epitaxial growth of (111)-oriented LaAlO3/LaNiO3 ultra-thin superlattices

Single phase, single orientation Cu2O (1 0 0) and (1 1 0) thin films grown by plasma-assisted molecular beam epitaxy

Auger Intensity Anomalies from ZnO(0001) Surface Excited by RHEED Incident Beam

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