Jean-Pascal Rueff

Jean-Pascal Rueff
SOLEIL synchrotron · GALAXIES beamline

PhD

About

238
Publications
28,992
Reads
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5,589
Citations
Citations since 2017
103 Research Items
2609 Citations
20172018201920202021202220230100200300400500
20172018201920202021202220230100200300400500
20172018201920202021202220230100200300400500
20172018201920202021202220230100200300400500
Additional affiliations
January 2001 - present
French National Centre for Scientific Research
Position
  • Research Director

Publications

Publications (238)
Article
Full-text available
We report the exceptional structural and magnetic stability of SrFeO2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$_2$$\end{document} under pressure by X-Ray Magnetic...
Article
The manipulation of magnetism with a gate voltage is expected to lead to the realization of energy-efficient spintronics devices and high-performance magnetic memories. Exploiting magnetoionic effects under micropatterned electrodes in solid-state devices adds the possibility of modifying magnetic properties locally, in a nonvolatile and reversible...
Preprint
Full-text available
We report the exceptional structural and magnetic stability of SrFeO2 under pressure by X-Ray Magnetic Circular Dichroism (XMCD) and X-ray Diffraction (XRD) up to the Mbar range. The XMCD data confirms the onset of ferromagnetism above 30 GPa and its stability up to 102 GPa while XRD shows that SrFeO2 structure remains unchanged from 30 GPa up to 1...
Article
Full-text available
It has been recently observed that a superconducting phase emerges under pressure in the Fe-based spin-ladders BaFe2X3 (X = S, Se). The low dimensionality of the Fe spin-ladders, which simplifies the elaboration of theoretical models, should help to understand the mechanism of superconductivity. We investigate here the frontier between magnetic and...
Article
This paper provides a review of the characterization of organic systems via X-ray Raman scattering (XRS) and a step-by-step guidance for its application. We present the fundamentals of XRS required to use the technique and discuss the main parameters of the experimental set-ups to optimize spectral and spatial resolution while maximizing signal-to-...
Article
Significance For millennia, Aboriginal Australian peoples have used the extraordinary physicochemical properties of plant exudates from practical applications to cultural expression. We employ state-of-the-art spectroscopy to characterize the molecular compositions of well-preserved, native Australian plant exudates ( Xanthorrhoea , Callitris , Euc...
Preprint
Full-text available
The manipulation of magnetism with a gate voltage is expected to lead the way towards the realization of energy-efficient spintronics devices and high-performance magnetic memories. Exploiting magneto-ionic effects under micro-patterned electrodes in solid-state devices adds the possibility to modify magnetic properties locally, in a non-volatile a...
Article
Driven by the continuous search for improving performances, understanding the phenomena at the electrode/electrolyte interfaces has become an overriding factor for the success of sustainable and efficient battery technologies for mobile and stationary applications. Toward this goal, rapid advances have been made regarding simulations/modeling techn...
Article
Li-ion batteries are the essential energy-storage building blocks of modern society. However, producing ultra-high electrochemical performance in safe and sustainable batteries for example, e-mobility, and portable and stationary applications, demands overcoming major technological challenges. Materials engineering and new chemistries are key aspec...
Article
In this work, we studied the bulk band structure of a topological insulator (TI) Bi2Se3 and determined the contributions of the Bi and Se orbital states to the valence bands using standing-wave excited hard x-ray photoemission spectroscopy (SW-HAXPES). This SW technique can provide the element-resolved information and extract individual Bi and Se c...
Article
With the ever-increasing demands of grid-scale energy storage, aqueous zinc-ion batteries (ZIBs) have garnered increasing attention around the world. However, limited Zn2+ host materials have hindered the commercialization of ZIBs. Hence, Mo-V oxides with different phase structures (orth-, tri-, and tetra-MoVO) were precisely constructed to develop...
Article
We have determined the depth profile of YCrO3/CaMnO3 superlattices by hard x-ray photoemission spectroscopy in near total reflection conditions. YCrO3/CaMnO3 is prone to exhibit interesting magnetotransport properties owing to the large amount of electron transfer expected between Cr³⁺ and Mn⁴⁺. The depth profile was reconstructed by simulating the...
Preprint
Full-text available
In this work, we studied the bulk band structure of a topological insulator (TI) Bi2Se3 and determined the contributions of the Bi and Se orbital states to the valence bands using standing wave-excited hard X-ray photoemission spectroscopy (SW-HAXPES). This SW technique can provide the element-resolved information and extract individual Bi and Se c...
Article
Full-text available
Hard x‐ray emission spectroscopy (XES) has been used to study buried layers and interfaces in a Fe/Si periodic multilayer. Until now, buried layers could be studied using the XES in the soft x‐ray range. Here, we extend the methodology to study the buried interfaces in hard x‐ray region (photon energy ≥ 5 keV). We report the formation of FeSi2 at a...
Article
We present a temperature- and doping-dependent resonant inelastic x-ray scattering experiment at the V L2,3 and O K edges in La1−xSrxVO3 thin films with x=0 and x=0.1. This material is a canonical example of a compound that exhibits a filling-control metal-insulator transition and undergoes orbital ordering and antiferromagnetic transitions at low...
Article
Among europium compounds, pressure induced valence transitions and/or intermediate valence states are often observed. In such systems, applying pressure of several GPa can drive a Eu valence from divalent to almost trivalent. Non-centrosymmetric EuRhGe3 possesses magnetic Eu²⁺ ions and exhibits antiferromagnetic ordering at ∼11 K at ambient pressur...
Article
Full-text available
Ultrafast scattering process of high-energy carriers plays a key role in the performance of electronics and optoelectronics, and have been studied in several semiconductors. Core-hole clock spectroscopy is a unique technique for providing ultrafast charge transfer information with sub-femtosecond timescale. Here we demonstrate that germanium seleni...
Article
We characterize experimentally and theoretically the high-energy dielectric screening properties of the prototypical correlated metal SrVO3. The dynamical structure factor measured by inelastic x-ray scattering spectroscopy as a function of momentum transfer is in very good agreement with first-principles calculations in the adiabatic local-density...
Preprint
Full-text available
We characterize experimentally and theoretically the high-energy dielectric screening properties of the prototypical correlated metal SrVO$_3$. The dynamical structure factor measured by inelastic x-ray scattering spectroscopy as a function of momentum transfer is in very good agreement with first-principles calculations in the adiabatic local dens...
Article
Full-text available
Doppler and recoil effects are an integral part of the photoemission process at the high kinetic energies reached in hard x-ray photo-electron spectroscopy (HAXPES) and have a major effect on the observed lineshape, resulting in broadening, energy losses and discrete excitations. These effects can be modeled with a high degree of detail for small s...
Article
Full-text available
Time-resolved ARPES makes it possible to directly visualize the band dispersion of photoexcited solids, as well as to study its time evolution on the femtosecond time scale. In this article, we show how this technique can be used to monitor the ultrafast hot carrier dynamics and the conduction band dispersion in two typical monochalcogenide semicon...
Article
Full-text available
Negative static charge and induced internal electric field have often been observed in the interfaces between silicon and high‐κ dielectrics, for example Al2O3 and HfO2. The electric field provides either beneficial (e.g., field‐effect passivation) or harmful (e.g., voltage instability) effect depending on the application. Different intrinsic and e...
Article
We have investigated the local Fe electronic changes in the square planar Fe(II) compound SrFeO2 by x-ray emission (XES) and x-ray absorption spectroscopy (XAS) through the pressure-induced spin transition up to 60 GPa. The analysis of Fe Kβ XES confirms the transition under pressure from a high spin to intermediate spin state at Pc=43 GPa while XA...
Article
Full-text available
A multi-edge study of the local structure of lithium borate glasses and melts has been carried out using X-ray Raman scattering (XRS) as a function of temperature. Thanks to a wide range of compositions, from pure B2O3 up to the metaborate composition, we are able to finely interpret in detail the modifications of the local environment of both the...
Article
Full-text available
The discovery of a two-dimensional electron system (2DES) at the interfaces of perovskite oxides such as LaAlO3 and SrTiO3 has motivated enormous efforts in engineering interfacial functionalities with this type of oxide heterostructures. However, the fundamental origins of the 2DES are still not understood, e.g., the microscopic mechanisms of coex...
Preprint
Full-text available
With the ever-increasing demands of grid-scale energy storage, aqueous zinc-ion batteries (ZIBs) have garnered increasing attention around the world. However, limited Zn2+ host materials have hindered the commercialization of ZIBs. Hence, Mo-V oxides with different phase structures (orth-, tri-, and tetra-MoVO) were precisely constructed to develop...
Article
Full-text available
Significance Two-dimensional electron gases are an essential building block of today’s technology and attract broad interest in the context of material science or nanoengineering. Their widespread applications in many strategical sectors call for a direct visualization of hot electrons relaxation in an accumulation layer. In this work, we make use...
Preprint
We present a temperature and doping dependent resonant inelastic X-ray scattering experiment at the V L$_{2,3}$ and O K edges in La$_{1-x}$Sr$_x$VO$_3$ for $x=0$ and $x=0.1$. This material is a canonical example of a compound that exhibits a filling control metal-insulator transition and undergoes orbital ordering and antiferromagnetic transitions...
Article
Negative thermal expansion is an unusual phenomenon appearing in only a handful of materials, but pursuit and mastery of the phenomenon holds great promise for applications across disciplines and industries. Here we report use of x-ray spectroscopy and diffraction to investigate the 4f-electronic properties in Y-doped SmS and employ the Kondo volum...
Article
The pigment hypothesis and the interferences hypothesis suggested in the XIXth century in order to explain the colours of photochromatic images are discarded. The silver nanoparticle dispersions contained in the silver chloride matrix forming Becquerel images seem to be colour‐characteristic, indicating a plasmonic origin of the photochromatic imag...
Article
The first colours photographs were created by a process introduced by Edmond Becquerel in 1848. The nature of these photochromatic images colours motivated a debate between scientists during the 19 th century, which is still not settled. We present the results of chemical analysis (EDX, HAXPES and EXAFS) and morphology studies (SEM, STEM) aiming at...
Article
Recycling metallic powders used in the additive manufacturing (AM) process is essential for reducing the process cost, manufacturing time, energy consumption, and metallic waste. In this paper, the focus is on pore formation in recycled powder particles of stainless steel 316L during the selective laser melting process. We have introduced the conce...
Preprint
Full-text available
The first colours photographs were created by a process introduced by Edmond Becquerel in 1848. The nature of these photochromatic images colours motivated a debate between scientists during the 19th century, which is still not settled. We present the results of chemical analysis (EDX, HAXPES and EXAFS) and morphology studies (SEM, STEM) aiming at...
Conference Paper
Deciphering the chemical nature of carbon-based compounds in ancient materials is now possible in three dimensions [1]. We use X-ray Raman imaging (XRI), a novel synchrotronbased hard X-ray technique first proposed by Huotari et al. [2], to visualize at each point the chemical composition of a 53-million-year-old ant preserved in amber (Fig. 1A). T...
Preprint
Full-text available
Edmond Becquerel invented in 1848 the first colour photographic process and used it to record the solar spectrum with its own colours, as well as to take pictures in the camera obscura. The "photochromatic images", as he named them, raised several questions, the main being that of the origin of their colours. Here, we present the characterization o...
Preprint
Full-text available
The discovery of a two-dimensional electron system (2DES) at the interfaces of perovskite oxides such as LaAlO3 and SrTiO3 has motivated enormous efforts in engineering interfacial functionalities with this type of oxide heterostructures. However, its fundamental origins are still not understood, e.g. the microscopic mechanisms of coexisting interf...
Article
Full-text available
Transition metal oxides are promising candidates in the development of valence change memories thanks to their ability to present valence change mechanism. The resistive switching mechanism of TiN/LaMnO3+  /Pt devices was investigated by operando hard X-ray photoelectron spectroscopy after careful in situ electrical characterization. The results p...
Article
L’identification des composés à base de carbone, bien que difficile, est une source d’information essentielle dans de nombreuses études archéologiques et paléontologiques. La diffusion Raman de rayons X est une méthode de spectroscopie sur synchrotron qui permet d’identifier des signatures organiques, de retracer l’origine chimique des systèmes étu...
Article
Detecting and quantifying non-bridging oxygen (NBO) atoms is of particular interest for understanding the physical properties of melts or compressed materials, and requires an unequivocal spectral signature usable during in-situ measurements. In this paper, we evidence a low-energy feature of NBO in lithium silicate crystals using X-ray Raman scatt...
Article
Using X-ray emission spectroscopy, we find appreciable local magnetic moments until 30 GPa to 40 GPa in the high-pressure phase of iron; however, no magnetic order is detected with neutron powder diffraction down to 1.8 K, contrary to previous predictions. Our first-principles calculations reveal a “spin-smectic” state lower in energy than previous...
Article
We study 1s and 2p hard x-ray photoemission spectra (XPS) in a series of late transition metal oxides: Fe2O3 (3d5), FeTiO3 (3d6), CoO (3d7), and NiO (3d8). The experimental spectra are analyzed with two theoretical approaches: MO6 cluster model and local density approximation (LDA) + dynamical mean-field theory (DMFT). Owing to the absence of the c...
Article
Full-text available
The Fe/MgO magnetic tunnel junction is a classic spintronic system, with current importance technologically and interest for future innovation. The key magnetic properties are linked directly to the structure of hard-to-access buried interfaces, and the Fe and MgO components near the surface are unstable when exposed to air, making a deeper probing...
Article
Thin films of OH terminated poly-2-vinylpyridine (P2VP), a polymer with potential for infiltration mediated thin film deposition, area selective deposition (ASD), and small feature size development via block copolymer (BCP) self-assembly, have been studied with hard x-ray photoelectron spectroscopy. From the N 1s and C 1s core level spectra, accura...
Article
Full-text available
The in situ two-dimensional (2D) and 3D imaging of the chemical speciation of organic fossils is an unsolved problem in paleontology and cultural heritage. Here, we use x-ray Raman scattering (XRS)–based imaging at the carbon K-edge to form 2D and 3D images of the carbon chemistry in two exceptionally preserved specimens, a fossil plant dating back...
Preprint
Negative thermal expansion is an unusual phenomenon appearing in only a handful of materials, but pursuit and mastery of the phenomenon holds great promise for applications across disciplines and industries. Here we report use of X-ray spectroscopy and diffraction to investigate the 4f-electronic properties in Y-doped SmS and employ the Kondo volum...
Preprint
Full-text available
The Fe/MgO magnetic tunnel junction is a classic spintronic system, with current importance technologically, and interest for future innovation. The key magnetic properties are linked directly to the structure of hard-to-access buried interfaces, and the Fe and MgO components near the surface are unstable when exposed to air, making a deeper probin...
Preprint
Full-text available
Using x-ray emission spectroscopy, we find appreciable local magnetic moments until 30--40 GPa in the high-pressure phase of iron, however no magnetic order is detected with neutron powder diffraction down to 1.8 K contrary to previous predictions. Our first-principles calculations reveal a "spin-smectic" state lower in energy than previous results...
Article
The efficiency in HIT (heterojunction with intrinsic thin film) solar cells strongly depends on the passivation of dangling bonds at the a‐Si:H/c‐Si interface by hydrogen, introduced during the plasma‐enhanced CVD process. Herein, controlled defects that are introduced by Ar ion irradiation have been studied. It has been observed by hard X‐ray phot...
Article
Iridates are often viewed as an equivalent of cuprates with strong spin-orbit coupling. As such, they offer a new way to study the physics of Mott insulators. The hybridization with oxygen is, of course, essential in both compounds and may play a crucial role in the doping process. It could be quite different in the two families, iridates being 5d...
Article
Full-text available
We present the observation of peculiar nonmonotonic photon energy dependencies of the count rates and of the rocking curves of parametric down-conversion of x rays into ultraviolet far from any atomic resonances. The observations cannot be explained by models that consider only atomic or bond charge responses and suggest that collective phenomena c...
Preprint
Full-text available
The efficiency in HIT (Heterojunction with Intrinsic Thin film) solar cells strongly depends on the passivation of dangling bonds at the a-Si:H/c-Si interface by hydrogen, introduced in the plasma enhanced CVD process. Here in, we study controlled defects that are introduced by Ar ion irradiation. We observe by hard X-ray photoemission spectroscopy...
Article
Full-text available
Molybdenum trioxide (MoO3) suffers from poor conductivity, a low rate capability, and unsatisfactory cycling stability in lithium‐ion batteries. The aliovalent ion doping may present an effective way to improve the electrochemical performances of MoO3. Here, it is shown, by first‐principle calculations, that doping MoO3 with V by 12.5% can modulate...
Article
GALAXIES is an in-vacuum undulator hard X-ray micro-focused beamline dedicated to the study of the electronic structure of materials with high energy resolution using both photoelectron spectroscopy and inelastic X-ray scattering and under both non-resonant (NR-IXS) and resonant (RIXS) conditions. Due to the penetrating power of hard X-rays and the...
Article
Full-text available
Abstract We report the chemical phenomena involved in the reverse forming (negative bias on top electrode) and reset of a TaN/TiTe/Al2O3/Ta memory stack. Hard X-ray photoelectron spectroscopy was used to conduct a non-destructive investigation of the critical interfaces between the electrolyte (Al2O3) and the TiTe top and Ta bottom electrodes. Duri...
Preprint
Full-text available
We study $1s$ and $2p$ hard x-ray photoemission spectra (XPS) in a series of late transition metal oxides: Fe$_2$O$_3$ (3$d^{5}$), FeTiO$_3$ (3$d^{6}$), CoO (3$d^{7}$) and NiO (3$d^{8}$). The experimental spectra are analyzed with two theoretical approaches: the MO$_6$ cluster model and the local density approximation (LDA) + dynamical mean-field t...
Article
Full-text available
We investigate black phosphorous by time and angle resolved photoelectron spectroscopy. The electrons excited by 1.57 eV photons, relax down to conduction band minimum within 1 ps. Despite the low bandgap value, no relevant amount of carrier multiplication could be detected at excitation density $3-6\times10^{19}$ cm$^{-3}$. In the thermalized stat...
Article
LaCrO 3 (LCO)/SrTiO 3 (STO) heterojunctions are intriguing due to a polar discontinuity along [001], exhibiting two distinct and controllable charged interface structures [(LaO) + /(TiO 2) 0 and (SrO) 0 /(CrO 2) − ] with induced polarization, and a resulting depth-dependent potential. In this study, we have used soft-and hard-x-ray standing-wave ex...
Article
Whereas electronic properties of As-bearing compounds find various industrial applications in smartphone and photovoltaic devices, or in superconductor materials, arsenic is a toxic element present in a variety of contaminated surface environments. In natural media, the knowledge of its chemical speciation and oxidation state is crucial to apprehen...
Article
Pd/Y multilayers are high-reflectance mirrors designed to work in the 7.5–11 nm wavelength range. Samples, prepared by magnetron sputtering, are deposited with or without B 4 C barrier layers located at the interfaces of the Pd and Y layers to reduce interdiffusion, which is expected from calculating the mixing enthalpy of Pd and Y. Grazing-inciden...
Preprint
In this article, we will discuss the recent developments of HAXPES at the GALAXIES beamline at the SOLEIL synchrotron for the study of advanced materials.
Article
X-ray absorption and Auger electron spectroscopies are demonstrated to be powerful tools to unravel the electronic structure of solvated ions. In this work for the first time we use a combination of these methods in the tender x-ray regime. This allowed us to address electronic transitions from deep core levels and to probe environmental effects, s...