S. Ravy
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View article: Vibrational-mechanical properties of the highly-mismatched Cd1−xBexTe semiconductor alloy: experiment and ab initio calculations
Vibrational-mechanical properties of the highly-mismatched Cd1−xBexTe semiconductor alloy: experiment and ab initio calculations Open
The emerging CdTe–BeTe semiconductor alloy that exhibits a dramatic mismatch in bond covalency and bond stiffness clarifying its vibrational-mechanical properties is used as a benchmark to test the limits of the percolation model (PM) work…
View article: Vibrational-mechanical properties of the highly-mismatched Cd1-xBexTe semiconductor alloy – Experiment and ab initio calculations
Vibrational-mechanical properties of the highly-mismatched Cd1-xBexTe semiconductor alloy – Experiment and ab initio calculations Open
The emerging CdTe-BeTe semiconductor alloy that exhibits a dramatic mismatch in bond covalency / stiffness clarifying its vibrational-mechanical properties is used as a benchmark to test the limits of the percolation model (PM) worked out …
View article: Foreword: Ultrafast Phenomena in condensed matter physics
Foreword: Ultrafast Phenomena in condensed matter physics Open
Matter is dynamic and changes under the effect of various external constraints, in particular light. The development of ultra-fast techniques now makes it possible to study the elementary mechanisms of ultrafast photoinduced phenomena, in …
View article: Photoinduced charge density wave phase in 1T-TaS<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow/> <mml:mn>2</mml:mn> </mml:msub></mml:math>: growth and coarsening mechanisms
Photoinduced charge density wave phase in 1T-TaS : growth and coarsening mechanisms Open
Recent experiments have shown that the high-temperature incommensurate (I) charge density wave (CDW) phase of 1T-TaS can be photoinduced from the lower-temperature, nearly commensurate CDW state. In a first step, several independent regio…
View article: Exceptional Phonon Point Versus Free Phonon Coupling in Zn1-xBexTe Under Pressure: An Experimental and ab Initio Raman Study
Exceptional Phonon Point Versus Free Phonon Coupling in Zn1-xBexTe Under Pressure: An Experimental and ab Initio Raman Study Open
Raman scattering and ab initio Raman/phonon calculations, supported by X-ray diffraction, are combined to study the vibrational properties of Zn1-xBexTe under pressure. The dependence of the Be-Te (distinct) and Zn-Te (compact) Raman doubl…
View article: Charge Order and Suppression of Superconductivity in HgBa2CuO4+d at High Pressures
Charge Order and Suppression of Superconductivity in HgBa2CuO4+d at High Pressures Open
New insight into the superconducting properties of HgBa2CuO4 (Hg-1201) cuprates is provided by combined measurements of electrical resistivity and single crystal X-ray diffraction under pressure. The changes induced by increasing pressure …
View article: Guest editors
Guest editors Open
a professor at the University of Rennes 1, specializing in the study of systems with coupled electronic and structural instabilities, such as neutral-ionic transitions, spin transitions or the charge transfer transitions.After a post-docto…
View article: Imaging shape and strain in nanoscale engineered semiconductors for photonics by coherent x-ray diffraction
Imaging shape and strain in nanoscale engineered semiconductors for photonics by coherent x-ray diffraction Open
View article: Reply to: Ultrafast evolution and transient phases of a prototype out-of-equilibrium Mott-Hubbard material
Reply to: Ultrafast evolution and transient phases of a prototype out-of-equilibrium Mott-Hubbard material Open
View article: MicaPenrose: a work of art as a tool to teach and popularize crystallography
MicaPenrose: a work of art as a tool to teach and popularize crystallography Open
We present a recently created work of art, a Penrose tiling made of mica tiles sandwiched between two sheets of polarizers, and placed on a LED panel of 60 cm x 60 cm.Due to the birefringence of mica, the piece exhibits beautiful and shimm…
View article: Sub-na and sub-ps time-resolved diffraction at CRISTAL beamline – SOLEIL synchrotron
Sub-na and sub-ps time-resolved diffraction at CRISTAL beamline – SOLEIL synchrotron Open
View article: Incommensurate charge-density-waves as seen by time-resolved x-ray diffraction
Incommensurate charge-density-waves as seen by time-resolved x-ray diffraction Open
View article: Domain-size effects on the dynamics of a charge density wave in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant="normal">T</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>TaS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Domain-size effects on the dynamics of a charge density wave in Open
Recent experiments have shown that the high temperature incommensurate (I)\ncharge density wave (CDW) phase of 1T-TaS2 can be photoinduced from the lower\ntemperature, nearly commensurate (NC) CDW state. Here we report a time-resolved\nx-r…
View article: Time-resolved X-ray diffraction on density-wave systems
Time-resolved X-ray diffraction on density-wave systems Open
Spin-(SDW) and Charge-density waves (CDW) systems are ubiquitous states in solid state physics.They both correspond to a modulation of the spin-or the charge-density, with twice the Fermi wave vector of the electron gas.Both states are gap…
View article: Ultrafast Formation of a Charge Density Wave State in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>1</mml:mn><mml:mi>T</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mrow><mml:mi>TaS</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: Observation at Nanometer Scales Using Time-Resolved X-Ray Diffraction
Ultrafast Formation of a Charge Density Wave State in : Observation at Nanometer Scales Using Time-Resolved X-Ray Diffraction Open
Femtosecond time-resolved x-ray diffraction is used to study a photoinduced phase transition between two charge density wave (CDW) states in 1T-TaS_{2}, namely the nearly commensurate (NC) and the incommensurate (I) CDW states. Structural …
View article: Watching the birth of a charge density wave order: diffraction study on nanometer-and picosecond-scales
Watching the birth of a charge density wave order: diffraction study on nanometer-and picosecond-scales Open
Femtosecond time-resolved X-ray diffraction is used to study a photo-induced phase transition between two charge density wave (CDW) states in 1T-TaS$_2$, namely the nearly commensurate (NC) and the incommensurate (I) CDW states. Structural…
View article: Ultrafast evolution and transient phases of a prototype out-of-equilibrium Mott–Hubbard material
Ultrafast evolution and transient phases of a prototype out-of-equilibrium Mott–Hubbard material Open
View article: Laser-Induced Charge-Density-Wave Transient Depinning in Chromium
Laser-Induced Charge-Density-Wave Transient Depinning in Chromium Open
We report on time-resolved x-ray diffraction measurements following femtosecond laser excitation in pure bulk chromium. Comparing the evolution of incommensurate charge-density-wave (CDW) and atomic lattice reflections, we show that, a few…
View article: X-ray study of femtosecond structural dynamics of the charge-density wave compound 1T-TaS2
X-ray study of femtosecond structural dynamics of the charge-density wave compound 1T-TaS2 Open
T-TaS2 is a 2D metallic compound which undergoes a series of electronically driven phase transitions toward charge density wave and Mott phases. Its intricate electron-phonon interactions and electron- electron correlations have been promi…
View article: Pressure-induced phonon freezing in the ZnSeS II–VI mixed crystal: phonon–polaritons and<i>ab initio</i>calculations
Pressure-induced phonon freezing in the ZnSeS II–VI mixed crystal: phonon–polaritons and<i>ab initio</i>calculations Open
Near-forward Raman scattering combined with ab initio phonon and bond length calculations is used to study the 'phonon-polariton' transverse optical modes (with mixed electrical-mechanical character) of the II-VI ZnSe1-x S x mixed crystal …
View article: Ordering phenomena of high-spin/low-spin states in stepwise spin-crossover materials described by the ANNNI model
Ordering phenomena of high-spin/low-spin states in stepwise spin-crossover materials described by the ANNNI model Open
We study the complex spin-state switching mechanism in a bistable molecular crystal undergoing a stepwise conversion from high-spin to low-spin states at thermal equilibrium as well as during the relaxation process from the photoinduced me…
View article: Charge order and suppression of superconductivity in HgBa2CuO4 at high\n pressures
Charge order and suppression of superconductivity in HgBa2CuO4 at high\n pressures Open
New insight into the superconducting properties of HgBa2CuO4 (Hg-1201)\ncuprates is provided by combined measurements of the electrical resistivity and\nsingle crystal X-ray diffraction under pressure. The changes induced by\nincreasing pr…
View article: Charge order and suppression of superconductivity in HgBa2CuO4 at high pressures
Charge order and suppression of superconductivity in HgBa2CuO4 at high pressures Open
New insight into the superconducting properties of HgBa2CuO4 (Hg-1201) cuprates is provided by combined measurements of the electrical resistivity and single crystal X-ray diffraction under pressure. The changes induced by increasing press…
View article: Long-range modulation of a composite crystal in a five-dimensional superspace
Long-range modulation of a composite crystal in a five-dimensional superspace Open
The intergrowth crystal of n-tetracosane/urea presents a misfit parameter, defined by the ratio γ = ch /cg (chost/cguest), that is very close to a commen…