Ewen Bellec
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View article: Practicals for Master 2 Quantum Matter of UGA: proximity effects in Ho layers
Practicals for Master 2 Quantum Matter of UGA: proximity effects in Ho layers Open
We will investigate the magnetic ordering in epitaxial layers of Ho-Lu alloy and Ho/Lu multilayers to characterise the proximity effect of Lu (non-magnetic) on Ho (conical/helical antiferromagnet at low temperature). We will perform X-ray …
View article: Phase Retrieval of Highly Strained Bragg Coherent Diffraction Patterns using Supervised Convolutional Neural Network
Phase Retrieval of Highly Strained Bragg Coherent Diffraction Patterns using Supervised Convolutional Neural Network Open
In Bragg Coherent Diffraction Imaging (BCDI), Phase Retrieval of \textit{highly} strained crystals is often challenging with standard iterative algorithms. This computational obstacle limits the potential of the technique as it precludes t…
View article: Kinetics of Hydrogen Absorption in Individual α-Phase Palladium Nanoparticles
Kinetics of Hydrogen Absorption in Individual α-Phase Palladium Nanoparticles Open
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View article: Probing Strain in Individual Palladium Nanocrystals during Electrochemically Induced Phase Transitions
Probing Strain in Individual Palladium Nanocrystals during Electrochemically Induced Phase Transitions Open
The palladium-hydrogen system plays a crucial role in catalysis, hydrogen production and storage, hydrogen embrittlement, and sensing technologies. Understanding the transition of palladium nanocrystals (NCs) from the hydrogen-poor (α) pha…
View article: Phase Retrieval of Highly Strained Bragg Coherent Diffraction Patterns using Supervised Convolutional Neural Network
Phase Retrieval of Highly Strained Bragg Coherent Diffraction Patterns using Supervised Convolutional Neural Network Open
In Bragg Coherent Diffraction Imaging (BCDI), Phase Retrieval of highly strained crystals is often challenging with standard iterative algorithms. This computational obstacle limits the potential of the technique as it precludes the recons…
View article: Probing Strain in Individual Palladium Nanocrystals during Electrochemically-Induced Phase Transitions
Probing Strain in Individual Palladium Nanocrystals during Electrochemically-Induced Phase Transitions Open
The palladium-hydrogen system is essential for applications in water electrolysis, catalysis, hydrogen storage, and hydrogen sensing technologies. Understanding the transition of Pd nanocrystals from the hydrogen-poor (α) phase to the hydr…
View article: The importance of shear on the collective charge transport in CDWs revealed by an XFEL source
The importance of shear on the collective charge transport in CDWs revealed by an XFEL source Open
Charge transport in materials has an impact on a wide range of devices based on semiconductor, battery, or superconductor technology. Charge transport in sliding charge density waves (CDW) differs from all others in that the atomic lattice…
View article: Patching-based deep-learning model for the inpainting of Bragg coherent diffraction patterns affected by detector gaps
Patching-based deep-learning model for the inpainting of Bragg coherent diffraction patterns affected by detector gaps Open
A deep-learning algorithm is proposed for the inpainting of Bragg coherent diffraction imaging (BCDI) patterns affected by detector gaps. These regions of missing intensity can compromise the accuracy of reconstruction algorithms, inducing…
View article: Seeing Inside Palladium Hydrides with X-rays
Seeing Inside Palladium Hydrides with X-rays Open
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View article: Patching-based Deep Learning model for the Inpainting of Bragg Coherent Diffraction patterns affected by detectors' gaps
Patching-based Deep Learning model for the Inpainting of Bragg Coherent Diffraction patterns affected by detectors' gaps Open
We propose a deep learning algorithm for the inpainting of Bragg Coherent Diffraction Imaging (BCDI) patterns affected by detector gaps. These regions of missing intensity can compromise the accuracy of reconstruction algorithms, inducing …
View article: Charge Density Wave bending observed by Xfel source acting as a tunable electronic lens for hard x-rays
Charge Density Wave bending observed by Xfel source acting as a tunable electronic lens for hard x-rays Open
Ultrafast X-ray diffraction by the LCLS free-electron laser has been used to probe Charge Density Wave (CDW) systems under applied external currents. At sufficiently low currents, CDW wavefronts bend in the direction transverse to the 2k$_…
View article: Tracking Defects of Electronic Crystals by Coherent X-ray Diffraction
Tracking Defects of Electronic Crystals by Coherent X-ray Diffraction Open
In this article, we review different studies based on advanced X-ray diffraction techniques—especially coherent X-ray diffraction—that allowed us to reveal the behaviour of such symmetry-breaking systems as Charge Density Wave (CDW) and Sp…
View article: Charge-Density-Waves Tuned by Crystal Symmetry
Charge-Density-Waves Tuned by Crystal Symmetry Open
The electronic orders appearing in condensed matter systems are originating from the precise arrangement of atoms constituting the crystal as well as their nature. This teneous relationship can lead to highly different phases in condensed …
View article: Micropipette aspiration as a tool for single-particle X-ray imaging and diffraction
Micropipette aspiration as a tool for single-particle X-ray imaging and diffraction Open
A sample environment and manipulation tool is presented for single-particle X-ray experiments in an aqueous environment. The system is based on a single water droplet, positioned on a substrate that is structured by a hydrophobic and hydro…
View article: <i>In situ</i> imaging of temperature-dependent fast and reversible nanoscale domain switching in a single-crystal perovskite
<i>In situ</i> imaging of temperature-dependent fast and reversible nanoscale domain switching in a single-crystal perovskite Open
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View article: Bragg coherent diffraction imaging of single 20 nm Pt particles at the ID01-EBS beamline of ESRF
Bragg coherent diffraction imaging of single 20 nm Pt particles at the ID01-EBS beamline of ESRF Open
Electronic or catalytic properties can be modified at the nanoscale level. Engineering efficient and specific nanomaterials requires the ability to study their complex structure–property relationships. Here, Bragg coherent diffraction imag…
View article: Coherent diffraction imaging at space-group forbidden reflections
Coherent diffraction imaging at space-group forbidden reflections Open
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View article: Structural Insights of Electrical Aging in PZT Thin Films as Revealed by In Situ Biasing X-ray Diffraction
Structural Insights of Electrical Aging in PZT Thin Films as Revealed by In Situ Biasing X-ray Diffraction Open
Electrical aging in lead zirconate titanate (PbZrxTi1−xO3) thin films has been intensively studied from a macroscopic perspective. However, structural origins and consequences of such degradation are less documented. In this study, we have…
View article: A convolutional neural network for defect classification in Bragg\n coherent X-ray diffraction
A convolutional neural network for defect classification in Bragg\n coherent X-ray diffraction Open
Coherent diffraction imaging enables the imaging of individual defects, such\nas dislocations or stacking faults, in materials.These defects and their\nsurrounding elastic strain fields have a critical influence on the macroscopic\npropert…
View article: The essential role of surface pinning in the dynamics of charge density waves submitted to external dc fields
The essential role of surface pinning in the dynamics of charge density waves submitted to external dc fields Open
A Charge Density Wave (CDW) submitted to an electric field displays a strong shear deformation because of pinning at the lateral surfaces of the sample. This CDW transverse pinning was recently observed but has received little attention fr…
View article: Evidence of charge density wave transverse pinning by x-ray microdiffraction
Evidence of charge density wave transverse pinning by x-ray microdiffraction Open
A Charge Density Wave (CDW) submitted to an electric field displays a strong\nshear deformation because of pinning at the lateral surfaces of the sample.\nThis CDW transverse pinning was recently observed but has received little\nattention…
View article: Study of charge density wave materials under current by X-ray diffraction
Study of charge density wave materials under current by X-ray diffraction Open
The main subject of this manuscript is the X-ray diffraction of charge density wave (CDW) materials. We studied the quasi-1D NbSe3 crystal and the quasi-2D TbTe3. Several large instruments facilities were used for this study, the ESRF sync…