Éric Collet
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View article: Geler en chauffant
Geler en chauffant Open
(Text in French) How is it possible to freeze the positions of atoms constituting a material by heating it? This concept, linked to the changes of symmetry and entropy, opens the way to the development of innovative devices capable of func…
View article: Unveiling Zn incorporation in CuInS$_2$ quantum dots: X-ray and optical analysis of doping effects, structural modifications and surface passivation
Unveiling Zn incorporation in CuInS$_2$ quantum dots: X-ray and optical analysis of doping effects, structural modifications and surface passivation Open
Quantum dots (QDs) exhibit unique properties arising from their reduced size and quantum confinement effects, including exceptionally bright and tunable photoluminescence. Among these, CuInS$_{2}$ QDs have gained significant attention owin…
View article: Photoinduced phase nucleation driven by multiscale charge transfer and symmetry change dynamics
Photoinduced phase nucleation driven by multiscale charge transfer and symmetry change dynamics Open
Understanding photoinduced phase transitions is key for developing optoelectronic devices based on the ultrafast control of multifunctional materials. Still, how macroscopic transformations emerge from local excitations remains poorly unde…
View article: Selective Tracking of Charge Carrier Dynamics in CuInS<sub>2</sub> Quantum Dots
Selective Tracking of Charge Carrier Dynamics in CuInS<sub>2</sub> Quantum Dots Open
CuInS2 quantum dots have been studied in a broad range of applications, but despite this, the fine details of their charge carrier dynamics remain a subject of intense debate. Two of the most relevant points of discussion are the hole dyna…
View article: Progress in the Development of Multi-Element Monolithic Germanium Detectors in LEAPS-INNOV Project: Insights from Detector Performance Simulation
Progress in the Development of Multi-Element Monolithic Germanium Detectors in LEAPS-INNOV Project: Insights from Detector Performance Simulation Open
This study presents a detailed simulation-based analysis of the detection limits of multi-element monolithic Germanium (Ge) detectors to cadmium traces in environmental soil samples. Using the capabilities of the Geant4 Monte Carlo toolkit…
View article: Next Generation Multi-element monolithic Germanium detectors for Spectroscopy: First integration at ESRF facility
Next Generation Multi-element monolithic Germanium detectors for Spectroscopy: First integration at ESRF facility Open
The XAFS-DET work package of the European LEAPS-INNOV project is developing a high-purity Germanium detectors for synchrotron applications requiring spectroscopic-grade response. The detectors integrate three key features: (1) newly design…
View article: Ultrafast charge-transfer-induced spin transition in cobalt-tungstate molecular photomagnets
Ultrafast charge-transfer-induced spin transition in cobalt-tungstate molecular photomagnets Open
In photoinduced phase transition materials, where both charge transfer and spin transition occur, there has been a long debate on which of the two processes are leading the phase transition. Herein, we present experimental evidence support…
View article: Stabilizing low symmetry-based functions of materials at room temperature through isosymmetric electronic bistability
Stabilizing low symmetry-based functions of materials at room temperature through isosymmetric electronic bistability Open
We report on an unusual freezing of molecular positions upon heating. Such ascending symmetry-breaking phenomena pave the way to high-temperature applications of devices based on ferroelectric, ferroelastic or ferromagnetic functions of ma…
View article: Selective tracking of charge carrier dynamics in CuInS2 quantum dots
Selective tracking of charge carrier dynamics in CuInS2 quantum dots Open
CuInS2 quantum dots have been studied in a broad range of applications, but despite this, the fine details of their charge carrier dynamics remain a subject of intense debate. Two of the most relevant points of discussion are the hole dyna…
View article: Stabilizing low symmetry-based functions of materials at room temperature through isosymmetric electronic bistability
Stabilizing low symmetry-based functions of materials at room temperature through isosymmetric electronic bistability Open
Symmetry-breaking is pivotal for controlling ferroelectric, ferroelastic and/or ferromagnetic functions of materials, which enables applications in sensors, memories, transducers or actuators. Commonly, ferroic phases emerge from descendin…
View article: Stabilizing low-symmetry based functions of materials at high temperature
Stabilizing low-symmetry based functions of materials at high temperature Open
International audience
View article: Ultrafast Structural Dynamics of a Photoexcited Mn−Fe Charge‐Transfer Material in the Polaronic and Phase Transition Regimes
Ultrafast Structural Dynamics of a Photoexcited Mn−Fe Charge‐Transfer Material in the Polaronic and Phase Transition Regimes Open
The Rb 0.94 Mn 0.94 Co 0.06 [Fe(CN) 6 ] 0.98 material was designed to exhibit a 75 K wide thermal hysteresis around room temperature, associated with a bistability between the low temperature Mn III Fe II tetragonal phase and the high temp…
View article: From Ultrafast Photoinduced Small Polarons to Cooperative and Macroscopic Charge‐Transfer Phase Transition
From Ultrafast Photoinduced Small Polarons to Cooperative and Macroscopic Charge‐Transfer Phase Transition Open
We study by femtosecond infrared spectroscopy the ultrafast and persistent photoinduced phase transition of the Rb 0.94 Mn 0.94 Co 0.06 [Fe(CN) 6 ] 0.98 ⋅ 0.2H 2 O material, induced at room temperature by a single laser shot. This system e…
View article: Observation of a Picosecond Light-Induced Spin Transition in Polymeric Nanorods
Observation of a Picosecond Light-Induced Spin Transition in Polymeric Nanorods Open
Spin transition (ST) materials are attractive for developing photoswitchable devices, but their slow material transformations limit device applications. Size reduction could enable faster switching, but the photoinduced dynamics at the nan…
View article: Left- versus right-handed badminton slice shots: opposite spinning of the chiral shuttlecock and Magnus effect
Left- versus right-handed badminton slice shots: opposite spinning of the chiral shuttlecock and Magnus effect Open
The chiral nature of a badminton shuttlecock is responsible for its counter-clockwise spinning as it naturally propagates through the air. This induces a dissymmetry between left- and right-handed players and the resulting trajectories of …
View article: Strain-affected ferroelastic domain walls in RbMnFe charge-transfer materials undergoing collective Jahn–Teller distortion
Strain-affected ferroelastic domain walls in RbMnFe charge-transfer materials undergoing collective Jahn–Teller distortion Open
This X-ray diffraction study of RbMnFe materials reveals the ferroelastic domains walls resulting from collective Jahn–Teller distortion coupled to intermetallic charge-transfer and the spatial extension of the strain around the walls.
View article: Introduction to order, disorder and ultrafast phenomena in functional solids
Introduction to order, disorder and ultrafast phenomena in functional solids Open
Tokoro Hiroko, Eric Collet and Ernest Pastor introduce the Materials Advances themed collection on order, disorder and ultrafast phenomena in functional solids.
View article: Detection of a Jahn–Teller mode as an ultrafast fingerprint of spin-transition-induced charge transfer in CoFe Prussian Blue Analogue
Detection of a Jahn–Teller mode as an ultrafast fingerprint of spin-transition-induced charge transfer in CoFe Prussian Blue Analogue Open
Using sub-20-fs ultrafast spectroscopy, we unravel high-frequency vibrational coherences during the photoinduced charge transfer in the CoFe Prussian Blue Analogue, attributed to the transient activation of a low-symmetry Jahn–Teller mode.
View article: Raw Data and Codes for the Article "Ultrafast and persistent photoinduced phase transition at room temperature monitored by streaming powder diffraction"
Raw Data and Codes for the Article "Ultrafast and persistent photoinduced phase transition at room temperature monitored by streaming powder diffraction" Open
Dataset for the article "Ultrafast and persistent photoinduced phase transition at room temperature monitored by streaming powder diffraction", containing: The data and the codes used to generate the figures The raw data used for the study…
View article: Raw Data and Codes for the Article "Ultrafast and persistent photoinduced phase transition at room temperature monitored by streaming powder diffraction"
Raw Data and Codes for the Article "Ultrafast and persistent photoinduced phase transition at room temperature monitored by streaming powder diffraction" Open
Dataset for the article "Ultrafast and persistent photoinduced phase transition at room temperature monitored by streaming powder diffraction", containing: The data and the codes used to generate the figures The raw data used for the study…
View article: Detection of a Jahn-Teller Mode as an Ultrafast Fingerprint of Spin-transition-induced Charge Transfer in CoFe Prussian Blue Analogue
Detection of a Jahn-Teller Mode as an Ultrafast Fingerprint of Spin-transition-induced Charge Transfer in CoFe Prussian Blue Analogue Open
Photoinduced spin transition is one of the fastest processes occurring in transition-metal-based molecules and materials, reaching down to tens of femtoseconds (1 fs = 1015 s). The underlying dynamics have been well characterized for monon…
View article: Multiscale out-of-equilibrium dynamics driven by pulsed laser excitation in spin-crossover materials: A combined thermoelastic and mechanoelastic study
Multiscale out-of-equilibrium dynamics driven by pulsed laser excitation in spin-crossover materials: A combined thermoelastic and mechanoelastic study Open
International audience
View article: CCDC 2220040: Experimental Crystal Structure Determination
CCDC 2220040: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2220043: Experimental Crystal Structure Determination
CCDC 2220043: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2220044: Experimental Crystal Structure Determination
CCDC 2220044: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2220037: Experimental Crystal Structure Determination
CCDC 2220037: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2220038: Experimental Crystal Structure Determination
CCDC 2220038: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …