A5090284981- Physics of Superconductivity and Magnetism
- Acoustic Wave Resonator Technologies
- Magnetic properties of thin films
- Semiconductor materials and devices
- Ultrasonics and Acoustic Wave Propagation
- Thin-Film Transistor Technologies
- Metal and Thin Film Mechanics
- Ferroelectric and Piezoelectric Materials
- Copper Interconnects and Reliability
- Electronic and Structural Properties of Oxides
- Diamond and Carbon-based Materials Research
- Silicon Nanostructures and Photoluminescence
- ZnO doping and properties
- Organic and Molecular Conductors Research
- Quantum and electron transport phenomena
- Nuclear Physics and Applications
- High-pressure geophysics and materials
- Magnetic Properties and Applications
- Solid-state spectroscopy and crystallography
- Semiconductor materials and interfaces
- GaN-based semiconductor devices and materials
- Theoretical and Computational Physics
- Electron and X-Ray Spectroscopy Techniques
- Silicon and Solar Cell Technologies
- Ion-surface interactions and analysis
Centre National de la Recherche Scientifique
2012-2025
Laboratoire de physique des Solides
2014-2025
Université Paris-Saclay
2022-2025
Université Paris-Sud
2011-2024
Synchrotron soleil
2020
Institut Néel
2007-2012
Université Joseph Fourier
1993-2011
Université Grenoble Alpes
2004-2011
Institut polytechnique de Grenoble
2011
Laboratoire de Cristallographie et Sciences des Matériaux
1995-2007
Abstract The precise arrangement and nature of atoms drive electronic phase transitions in condensed matter. To explore this tenuous link, we developed a true biaxial mechanical deformation device working at cryogenic temperatures, compatible with x-ray diffraction transport measurements, well adapted to layered samples. Here show that slight TbTe 3 can have dramatic influence on its Charge Density Wave (CDW), an orientational transition from c driven by the / parameter, tiny coexistence...
Abstract A portable system has been recently developed; it combines x‐ray fluorescence (XRF) and diffraction (XRD) techniques, allowing simultaneous elemental analysis phase identification of inorganic materials. low power (30 W) air‐cooled Cu anode source is used, equipped with a polycapillary semi‐lens to provide parallel beam. The designed without mechanical movements its configuration allows the objects arbitrary shapes; instrument particularly suitable for material in cultural heritage...
The experimental discovery of superconductivity in boron-doped diamond came as a major surprise to both the and superconducting materials communities. main results obtained since then on single-crystal epilayers are reviewed applied calculations, some open questions identified. critical doping metal-to-insulator transition (MIT) was found coincide with that necessary for occur. Some exponents MIT were determined follow conventional type II behaviour dirty limit, relatively high temperature...
We report on a combined structural and electronic analysis of niobium ultrathin films (from 2 to 10 nm) deposited in ultrahigh vacuum atomically flat R-plane sapphire wafers. A textured polycrystalline morphology is observed for the thinnest films, showing that heteroepitaxy not achieved under thickness 3.3 nm, which almost coincides with first measurement superconducting state. The critical temperature rise takes place very narrow range, order single monolayer (ML). sample (3 nm/9 ML) has...
Surface acoustic wave (SAW) propagation in a graphene film on the surface of piezoelectric crystals was studied at BESSY II synchrotron radiation source. Talbot effect enabled visualization SAW crystal with real time mode, and high-resolution x-ray diffraction permitted determination amplitude graphene/piezoelectric system. The influence electrical properties examined. It shown that changing enables controlling magnitude direction current crystals.
Ferroelectric LiNb1-xTaxO3 solid solutions with various Nb/Ta ratio were grown from the melt by Czochralski method. The exact composition of crystals was determined inductively coupled plasma atomic mass spectrometry. dependence crystal on initial obtained and explained a wide separation between phase boundaries liquid phases LiNbO3-LiTaO3 diagram. Using high-resolution X-ray diffraction, parameters c unit cell (LiNb0.88Ta0.12O3: = 5.1574 Å 13.8498 Å). Further, Curie temperature TC measured...
Charge transport in materials has an impact on a wide range of devices based semiconductor, battery, or superconductor technology. sliding charge density waves (CDW) differs from all others that the atomic lattice is directly involved process. To obtain overall picture structural changes associated to collective transport, large coherent x-ray beam generated by free-electron laser (XFEL) source was used. The CDW phase can be retrieved over entire sample diffracted intensities using genetic...
We present direct evidence of an ordered oxide which is epitaxially related to the underlying Si(001) substrate and distributed throughout thermally grown films with thicknesses between 80 1000 \AA{}. This consists diffraction peaks at $〈1, 1, 0.45〉$ positions. For thickness in range 80-160 \AA{} integrated intensity these increases roughly linearly grain size parallel surface constant 130
The in-depth distribution of the induced 5d magnetic moments across Ce layers in Fe/Ce/La/Ce, Fe/La/Ce/La and ${\mathrm{F}\mathrm{e}/\mathrm{C}\mathrm{e}\mathrm{H}}_{2\ensuremath{-}\ensuremath{\delta}}$ multilayers has been investigated by x-ray resonant scattering (XRMS) at ${L}_{2}$ edge. determination composition profile period multilayer is required for a quantitative analysis XRMS derived from reflectivity measurements. In Fe/Ce/La/Ce multilayers, adopts an $\ensuremath{\alpha}$-like...
We study the effect of hydrogen incorporation on lattice properties ${\mathrm{In}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{As}}_{1\ensuremath{-}y}{\mathrm{N}}_{y}/\mathrm{GaAs}$ heterostructures. The band gap widening observed in photoluminescence spectra hydrogenated ${\mathrm{GaAs}}_{1\ensuremath{-}y}{\mathrm{N}}_{y}$ and ${\mathrm{In}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{As}}_{1\ensuremath{-}y}{\mathrm{N}}_{y}$ is accompanied by a expansion along growth direction, as measured...
From structural analysis by x-ray diffraction, Rutherford backscattering spectroscopy, and physical investigations (magnetization resistance), reactive sputtering assisted microwave multidipolar plasma appears to be a powerful means for tailoring the stoichiometry of transition metal nitrides. Reactive sputtered nitride Ni layers were elaborated while keeping Ar partial pressure constant (∼1.5 μbar) varying N2 in 0.1–0.5 μbar range. A mixing Ni2N Ni3N single-phase are stabilized thin high...
We have used high-resolution x-ray scattering, in the presence of an applied direct current, for studying correlation lengths sliding charge-density wave (CDW) state. Transport properties were simultaneously measured situ during experiment. find that, while transverse is reduced when CDW moves, becomes more ordered direction motion. This first report a motional ordering process periodic system other than vortex lattice.
Structural characterization of a fully etched amorphous W/Si multilayer grating with lateral periodicity 800 nm is performed by x-ray reflectivity in the coplanar and non-coplanar modes using scintillation detector two-dimensional gas-filled detector, respectively. Three-dimensional reciprocal space constructions were used to explain scattering features recorded both geometries. Coplanar coherent truncation rods fitted dynamical theory for rough gratings. Comparison from reference planar...
Direct imaging of a 10 μm surface acoustic wave (SAW) propagation in La3Ga5SiO14 crystal was obtained on the European Synchrotron Radiation Facility (ESRF) synchrotron radiation source sagittal diffraction geometry using Talbot effect. Imaging SAW field with period observed at distance corresponding to half distance. It is shown that presence growth banding does not influence wave-fields nor it cause distortion front.