Year: 2015
Type: article
Abstract: The family of materials ${(\mathrm{EDO}\text{\ensuremath{-}}\mathrm{TTF})}_{2}\mathrm{X}{\mathrm{F}}_{6}$ represents quasi-one-dimensional quarter filled systems exhibiting insulator-to-metal (I-M) phase transition at thermal equilibrium. ${(\mathrm{EDO}\text{\ensuremath{-}}\mathrm{TTF})}_{2}\mathrm{P}{\mathrm{F}}_{6}$ is known to undergo a photoinduced I-M conversion with cooperative response to light excitation. Here we use femtosecond pump-probe experiments to study the photoresponse of ${(\mathrm{EDO}\text{\ensuremath{-}}\mathrm{TTF})}_{2}\mathrm{Sb}{\mathrm{F}}_{6}$ made of a larger counteranion $\mathrm{Sb}{\mathrm{F}}_{6}$ compared to the well studied ${(\mathrm{EDO}\text{\ensuremath{-}}\mathrm{TTF})}_{2}\mathrm{P}{\mathrm{F}}_{6}$. In the early stage of the photoinduced process, we reveal a multicomponent coherent oscillating feature. The evolution of this feature with excitation density and temperature points to the local nature of the photoswitching in ${(\mathrm{EDO}\text{\ensuremath{-}}\mathrm{TTF})}_{2}\mathrm{Sb}{\mathrm{F}}_{6}$. At longer time scale, we did not detect the features associated with the transformation to the M phase, albeit observed in the $\mathrm{P}{\mathrm{F}}_{6}$ derivative. We propose a scenario whereby the bigger size of the counteranion in ${(\mathrm{EDO}\text{\ensuremath{-}}\mathrm{TTF})}_{2}\mathrm{Sb}{\mathrm{F}}_{6}$ hinders the establishment of this transformation at macroscopic scale.
Source: Physical Review B
Institutions: Centre National de la Recherche Scientifique, Institut de Physique de Rennes, École Polytechnique, École Nationale Supérieure de Techniques Avancées, Université Paris-Saclay, Laboratoire d'Optique Appliquée, École Nationale Supérieure de Techniques Avancées Paris, Tokyo Institute of Technology, Kyoto University, Institute for Molecular Science
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,675
Awards: Exotic Molecular Assemblies based on Coronene, Development of organic conducting and magnetic materials based on high-symmetric molecules for thermoelectric application, G512485753, Cross-Correlated Physical Properties of Molecular Materials in Dimensional Crossover Region, Development of Electronic Multifunction Based on Organic Triangular Spin Lattice, Femtosecond X-ray and optical studies of ultrafast photoswitching dynamics in molecular-based magnetic materials, Development of Novel Phase Transition Mechanisms for Molecular Conductors by Applying Multiplicity of Electronic State Determinant Factors
OpenAlex ID: W2562906331