A5064084167- High-pressure geophysics and materials
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Geological and Geochemical Analysis
- Rare-earth and actinide compounds
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Iron-based superconductors research
- Crystal Structures and Properties
- Physics of Superconductivity and Magnetism
- Inorganic Chemistry and Materials
- earthquake and tectonic studies
- Boron and Carbon Nanomaterials Research
- Diamond and Carbon-based Materials Research
- Glass properties and applications
- Inorganic Fluorides and Related Compounds
- Advanced Chemical Physics Studies
- Material Dynamics and Properties
- Electronic and Structural Properties of Oxides
- 2D Materials and Applications
- Crystallography and molecular interactions
- Organic and Molecular Conductors Research
- Nuclear materials and radiation effects
- Nuclear Materials and Properties
- Multiferroics and related materials
European Synchrotron Radiation Facility
2016-2025
University of Warwick
2024
Queen Mary University of London
2024
University of Michigan
2024
Michigan United
2024
University of North Carolina at Chapel Hill
2024
Jingchu University of Technology
2024
Southern University of Science and Technology
2024
Soochow University
2024
European Science Foundation
2010-2022
Under Pressure In order to understand the behavior of materials in solid deep Earth, it is important be able estimate how a material melts at high pressure. To this end, Fiquet et al. (p. 1516 ) performed experiments using laser-heated diamond anvil cell coupled situ synchrotron measurements peridotite rock—a mixture minerals thought represent Earth's upper mantle—across wide pressure range. The results suggest that liquid phases may exist very values, such seismically anomalous zones near...
Squeezing into the third dimension Cuprate superconductors are known to harbor charge order in part of their phase diagram. Curiously, has a two-dimensional (2D) character at zero magnetic field, whereas 3D appears high fields. Kim et al. now show that yttrium-based cuprate, can be induced even field. The authors compressed material along one direction and measured large inelastic x-ray scattering signal was consistent with formation order. measurements suggest is associated an optical...
Polynitrogen compounds have been actively pursued driven by their potential as ultra-high-performing propellants or explosives. Despite remarkable breakthroughs over the past two decades, figures of merit for a compelling material, namely large fraction nitrogen weight and bulk stability under ambient conditions, not yet achieved. We report synthesis lithium pentazolate solid compressing laser-heating embedded in molecular N2 around 45 GPa along with its recovery conditions. The observation...
The equation of state KCl and KBr, compressed in a helium pressure medium diamond-anvil cell, has been measured by x-ray diffraction the B1 B2 phases up to 165 GPa at 298 K. $P$-$V$-$T$ KBr calculated ab initio molecular dynamics wide compression range 7000 thermal exhibits linear behavior with temperature remains low under high compression. experimental $P$-$V$ points have used set high-pressure--high-temperature KBr. With these equations state, can be as markers laser-heated...
Understanding the relationship between superconducting, neighboring insulating, and normal metallic state above T c is a major challenge for all unconventional superconductors. The molecular A3C60 fulleride superconductors have parent antiferromagnetic insulator in common with atom-based cuprates, but here, C60 (3-) electronic structure controls geometry spin of structural building unit via on-molecule Jahn-Teller effect. We identify metal as fluctuating microscopically heterogeneous...
The interplay between charge density wave (CDW) order and superconductivity has attracted much attention. This is the central issue of along standing debate in simple transition metal dichalcogenides without strong electronic correlations, such as 2H-NbSe$\_2$, which twosuch phases coexist. importance anisotropic electron-phonon interaction been recently highlighted from both theoretical experimental point view, explains some key features formation CDW this system. On other hand, aspects,...
Magnetization and high-resolution x-ray diffraction measurements of the Kitaev-Heisenberg material $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{RuCl}}_{3}$ reveal a pressure-induced crystallographic magnetic phase transition at hydrostatic pressure $p\ensuremath{\sim}0.2$ GPa. This structural into triclinic is characterized by very strong dimerization Ru-Ru bonds, accompanied collapse susceptibility. Ab initio quantum-chemistry calculations disclose enhancement direct...
The 5d transition metals have attracted specific interest for high-pressure studies due to their extraordinary stability and intriguing electronic properties. In particular, iridium metal has been proposed exhibit a recently discovered pressure-induced transition, the so-called core-level crossing at lowest pressure among all metals. Here, we report an experimental structural characterization of by x-ray probes sensitive both long- short-range order in matter. Synchrotron-based powder...
In this paper we provide an accurate high-pressure structural and optical study of MAPbI3 hybrid perovskite. Structural data show the presence a phase transition towards orthorhombic structure around 0.3 GPa followed by full amorphization system above 3 GPa. After releasing pressure systems keeps phase. The occurrence these transitions is further confirmed induced variations photoluminescence signal at high pressure. These clearly indicate that bandgap value electronic MAPI change across transition.
The yttrium-hydrogen system has gained attention because of near-ambient temperature superconductivity reports in yttrium hydrides at high pressures. We conducted a study using synchrotron single-crystal x-ray diffraction (SCXRD) 87 to 171 GPa, resulting the discovery known (two YH
We have studied the structural and superconducting properties of tetragonal FeSe under pressures up to 26GPa using synchrotron radiation diamond anvil cells. The bulk modulus phase is 28.5(3)GPa, much smaller than rest Fe based superconductors. At 12GPa we observe a transition from an orthorhombic symmetry. high pressure has higher Tc reaching 34K at 22GPa.
We report on high-pressure powder synchrotron x-ray diffraction studies $M$Fe${}_{2}$As${}_{2}$ ($M$$=$Ba, Ca) over a range of temperatures and pressures up to about 56 GPa using membrane diamond-anvil cell. Our data indicate phase transition collapsed tetragonal in both compounds upon compression. The at 300 K are measured pressure-increasing -decreasing cycles. measurements show that the Ba compound, occurs 27 GPa, which is much higher than pressure 1.7 Ca compound. At low temperature, we...
We investigate the high-pressure phase transitions in BiFeO${}_{3}$ by single-crystal and powder x-ray diffraction, as well Raman spectroscopy. Six are reported 0--60-GPa range. At low pressures, four evidenced at 4, 5, 7, 11 GPa. In this range, crystals display large unit cells complex domain structures, which suggests a competition between tilt systems possibly off-center cation displacements. The nonpolar $Pnma$ remains stable over pressure range 38 GPa, where distortion (tilt angle)...
Abstract As the main constituent of planetary cores, pure iron phase diagram under high pressure and temperature is fundamental importance in geophysics science. However, previously reported iron‐melting curves show large discrepancies (up to 1000 K at Earth's core–mantle boundary, 136 GPa), resulting persisting uncertainties on solid‐liquid boundary. Here we unambiguously that observed differences commonly attributed nature used melting diagnostic are due a carbon contamination sample as...
Abstract Gibbs energy representations for ices II, III, V, and VI are reported. These were constructed using new measurements of volumes at high pressure over a range low temperatures combined with calculated vibrational energies grounded in statistical physics. The collection released within the open source SeaFreeze program, together representation already known ice Ih water. This program allows accurate determination thermodynamics properties (phase boundaries, density, specific heat,...