Light-induced phase separation (LIPS) into like-spin phases observed by Laue neutron diffraction on a single crystal of [Fe(ptz)6](BF4)2
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François Varret
Abstract
We have followed the photo-transformation, the light-induced thermal hysteresis, and the light-induced phase separation (LIPS) into like-spin phases on a [Fe(ptz)6](BF4)2 single crystal, in the quenched rhombohedral phase, through the analysis of neutron Laue diffraction patterns. In agreement with the analysis of previous magnetic measurements, phase separation was observed in the close vicinity of the static light-induced instability, but not otherwise. The positions of the Laue spots were analysed in terms of variation in the a/c lattice-parameter ratio which is well correlated with the variation of the high-spin fraction predicted by a simple homogeneous mean-field model. Using a mapped version of the same model, we analyzed the line shapes of the Laue spots during photo-excitation and relaxation experiments so as to determine the width of the distribution of irradiation intensities, a crucial parameter in phase separation. The predictions of the mapped model failed to reproduce the rapid initial kinetics of the phase separation process, but were in agreement with the further evolution. These features are attributed to a nucleation and growth process, for which the crossover from microscopic to macroscopic regimes has been observed.
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Artikel in diesem Heft
- Preface: Photocrystallography
- Out-of-equilibrium charge density distribution of spin crossover complexes from steady-state photocrystallographic measurements: experimental methodology and results
- Light-induced phase separation (LIPS) into like-spin phases observed by Laue neutron diffraction on a single crystal of [Fe(ptz)6](BF4)2
- Neutron photocrystallography: simulation and experiment
- Static and time-resolved photocrystallographic studies in supramolecular solids
- State of the art and opportunities in probing photoinduced phase transitions in molecular materials by conventional and picosecond X-ray diffraction
- Real-time studies of reversible lattice dynamics by femtosecond X-ray diffraction
- Towards pump-probe resonant X-ray diffraction at femtosecond undulator sources
- Exploiting EXAFS and XANES for time-resolved molecular structures in liquids
- Home-based time-resolved photo small angle X-ray diffraction and its applications
- DFT study of crystalline nitrosyl compounds
- Theoretical study on the structure of the ground state and photo-induced metastable states of [M(CN)5NO]2− (M = Ru, Fe), and mechanism of the photo-rearrangement among them
- DFT study of metastable linkage isomers of six-coordinate ruthenium nitrosyl complexes
- Excited state isomerization in photochromic ruthenium complexes
- Applications of photocrystallography: a future perspective
Artikel in diesem Heft
- Preface: Photocrystallography
- Out-of-equilibrium charge density distribution of spin crossover complexes from steady-state photocrystallographic measurements: experimental methodology and results
- Light-induced phase separation (LIPS) into like-spin phases observed by Laue neutron diffraction on a single crystal of [Fe(ptz)6](BF4)2
- Neutron photocrystallography: simulation and experiment
- Static and time-resolved photocrystallographic studies in supramolecular solids
- State of the art and opportunities in probing photoinduced phase transitions in molecular materials by conventional and picosecond X-ray diffraction
- Real-time studies of reversible lattice dynamics by femtosecond X-ray diffraction
- Towards pump-probe resonant X-ray diffraction at femtosecond undulator sources
- Exploiting EXAFS and XANES for time-resolved molecular structures in liquids
- Home-based time-resolved photo small angle X-ray diffraction and its applications
- DFT study of crystalline nitrosyl compounds
- Theoretical study on the structure of the ground state and photo-induced metastable states of [M(CN)5NO]2− (M = Ru, Fe), and mechanism of the photo-rearrangement among them
- DFT study of metastable linkage isomers of six-coordinate ruthenium nitrosyl complexes
- Excited state isomerization in photochromic ruthenium complexes
- Applications of photocrystallography: a future perspective
