Imaging, Core-Loss, and Low-Loss Electron-Energy-Loss Spectroscopy Mapping in Aberration-Corrected STEM

Lazar, Sorin; Shao, Yang; Gunawan, Lina; Nechache, Riad; Pignolet, A.; Botton, Gianluigi A.

doi:10.1017/s1431927610013504

Cited by 38 publications

(28 citation statements)

References 29 publications

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“…While minima similar to those seen in the resonance images have been observed in the past [7,29,[31][32][33][34][35][36][37], those observations could be attributable to coherent effects arising from the use of a collection angle comparable or smaller than the probe convergence angle. In the present work, we use a large collection angle (80 mrad), where the incoherent nature of scattering and detection means that such minima are unexpected.…”

Section: Resultssupporting

confidence: 65%

Fano resonance in atomic-resolution spectroscopic imaging of solids

2012

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We report direct evidence of Fano resonances in atomic-resolution imaging of a crystalline material using a focused electron beam. Spectroscopic images of DyScO3 that are derived from the Fano resonance in the Dy-N4,5 spectrum can exhibit unexpected atomic-scale contrast, markedly different to non-resonant images. These effects are explained by our theoretical calculations of the inelastic and elastic scattering, and show excellent agreement with the experimental data. The results have significant implications for spectroscopic imaging of rare-earth elements at the atomic scale.

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Section: Resultssupporting

confidence: 65%

Fano resonance in atomic-resolution spectroscopic imaging of solids

2012

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“…Accordingly, a more complete description of the electronic structure of YBCO requires more direct means to distinguish the electronic structure of different sites. In this report, we make use of recent developments in EELS resolution [13][14][15][16] to measure O K and Cu L 2,3 spectra in YBa 2 Cu 3 O 6 þ d with sufficient spatial and energy resolution to clearly distinguish the role of the planes and chains in real space. We show atomically resolved elemental maps for both doped and undoped YBCO as well as fine structure differences between chains and planes at both the Cu L and the O K edges.…”

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confidence: 99%

Atomic scale real-space mapping of holes in YBa2Cu3O6+δ

et al. 2014

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The high-temperature superconductor YBa 2 Cu 3 O 6 þ d consists of two main structural units-a bilayer of CuO 2 planes that are central to superconductivity and a CuO 2 þ d chain layer. Although the functional role of the planes and chains has long been established, most probes integrate over both, which makes it difficult to distinguish the contribution of each. Here we use electron energy loss spectroscopy to directly resolve the plane and chain contributions to the electronic structure in YBa 2 Cu 3 O 6 and YBa 2 Cu 3 O 7 . We directly probe the charge transfer of holes from the chains to the planes as a function of oxygen content, and show that the change in orbital occupation of Cu is large in the chain layer but modest in CuO 2 planes, with holes in the planes doped primarily into the O 2p states. These results provide direct insight into the local electronic structure and charge transfers in this important high-temperature superconductor.

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“…Despite signal delocalization (up to a few nm), [46] high-resolution LLR spectroscopy is achievable with the use of an adequate instrumental setup. [47] Among the applications of LLR spectroscopy are mapping of the dielectric function, [48,49] mapping of the bonding hybridization type, [50] determination of the valence configuration, [51] assessment of the optical properties and band gap, [52] and measurement of the interface properties. [53] A combination of ZLP deconvolution and monochromator hardware have been successfully used to map surface plasmons in metallic nanoparticles.…”

Section: Eelsmentioning

confidence: 99%

High‐Resolution Scanning Transmission Electron Microscopy (HRSTEM) Techniques: High‐Resolution Imaging and Spectroscopy Side by Side

et al. 2012

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This work presents an overview of high-resolution scanning transmission electron microscopy (HRSTEM) techniques and exemplifies the novel quantitative characterization possibilities that have emerged from recent advances in these methods. The synergistic combination of atomic resolution imaging and spectroscopy provided by HRSTEM is highlighted as a unique feature that can provide a comprehensive analytical description of material properties at the nanoscale. State-of-the-art high-angle annular dark field and annular bright field examples are depicted as well as the use of X-ray energy-dispersive spectroscopy and electron energy-loss spectroscopy for probing samples properties at the atomic scale. In addition, promising techniques such as cathodoluminescence, confocal HRSTEM, and diffraction mapping are introduced. The presented examples and results indicate that HRSTEM-related techniques are fundamental tools for comprehensive assessment of properties at the atomic scale.

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Imaging, Core-Loss, and Low-Loss Electron-Energy-Loss Spectroscopy Mapping in Aberration-Corrected STEM

Cited by 38 publications

References 29 publications

Fano resonance in atomic-resolution spectroscopic imaging of solids

Fano resonance in atomic-resolution spectroscopic imaging of solids

Atomic scale real-space mapping of holes in YBa2Cu3O6+δ

High‐Resolution Scanning Transmission Electron Microscopy (HRSTEM) Techniques: High‐Resolution Imaging and Spectroscopy Side by Side

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