107 citations · 274 across the 12 of their papers we have counts for
13 papers
Brittle fracture studied by ultra-high speed synchrotron X-ray diffraction imaging
Antoine Petit, Sylvia Pokam, Frederic Mazen +7
Ever since the very first human-made knapped tools, the control of fracture propagation in brittle materials has been a vector of technological development. Nowadays, a broad range…
Contribution of X-ray experiments and modeling to the understanding of the heterogeneous lithiation of graphite electrodes
Samuel Tardif, Nicolas Dufour, Jean-Francois Colin +5
Distributions of potential and lithium content inside lithium ion batteries highly affects their performance and durability. An increased heterogeneity of the lithium distribution…
Germanium under high tensile stress: nonlinear dependence of direct band gap vs. strain
K. Guilloy, N. Pauc, A. Gassenq +15
Germanium is a strong candidate as a laser source for silicon photonics. It is widely accepted that the band structure of germanium can be altered by tensile strain so as to reduce…
Accurate strain measurements in highly strained Ge microbridges
A. Gassenq, S. Tardif, K. Guilloy +16
Ge under high strain is predicted to become a direct bandgap semiconductor. Very large deformations can be introduced using microbridge devices. However, at the microscale, strain…
Lattice strain and tilt mapping in stressed Ge microstructures using X-ray Laue micro-diffraction and rainbow-filtering
Samuel Tardif, Alban Gassenq, Kevin Guilloy +14
Micro-Laue diffraction and simultaneous rainbow-filtered micro-diffraction were used to measure accurately the full strain tensor and the lattice orientation distribution at the su…
Uniaxially stressed germanium with fundamental direct band gap
R. Geiger, T. Zabel, E. Marin +17
We demonstrate the crossover from indirect- to direct band gap in tensile-strained germanium by temperature-dependent photoluminescence. The samples are strained microbridges that…
All-in/all-out magnetic domains: X-ray diffraction imaging and magnetic field control
Samuel Tardif, Soshi Takeshita, Hiroyuki Ohsumi +5
Long-range non-collinear all-in/all-out magnetic order has been directly observed for the first time in real space in the pyrochlore CdOsO using resonant magnetic micro…
The optimal division between sample and background measurement time for photon counting experiments
Brian Richard Pauw, Samuel Tardif
Usually, equal time is given to measuring the background and the sample, or even a longer background measurement is taken as it has so few counts. While this seems the right thing…
Improvements and considerations for size distribution retrieval from small-angle scattering data by Monte-Carlo methods
Brian Richard Pauw, Jan-Skov Pedersen, Samuel Tardif +2
Monte-Carlo (MC) methods, based on random updates and the trial-and-error principle, are well suited to retrieve particle size distributions from small-angle scattering patterns of…
X-ray magnetic circular dichroism in (Ge,Mn) compounds: experiments and modeling
Samuel Tardif, Andrey Titov, Emmanuel Arras +10
X-ray absorption (XAS) and x-ray magnetic circular dichroism (XMCD) spectra at the L edges of Mn in (Ge,Mn) compounds have been measured and are compared to the results of…
Interface-driven phase separation in multifunctional materials: the case of GeMn ferromagnetic semiconductor
Emmanuel Arras, Frédéric Lançon, Ivetta Slipukhina +11
We use extensive first principle simulations to show the major role played by interfaces in the mechanism of phase separation observed in semiconductor multifunctional materials. W…
Exchange bias in GeMn nanocolumns: the role of surface oxidation
S. Tardif, S. Cherifi, M. Jamet +9
We report on the exchange biasing of self-assembled ferromagnetic GeMn nanocolumns by GeMn-oxide caps. The x-ray absorption spectroscopy analysis of this surface oxide shows a mult…
Strain and correlation of self-organized Ge_(1-x)Mn_x nanocolumns embedded in Ge (001)
S. Tardif, V. Favre-Nicolin, F. Lançon +8
We report on the structural properties of Ge_(1-x)Mn_x layers grown by molecular beam epitaxy. In these layers, nanocolumns with a high Mn content are embedded in an almost-pure Ge…