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| Naji, M. |
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Ohkoshi, Shin-Ichi
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Publications (5/5 displayed)
- 2024From Ultrafast Photoinduced Small Polarons to Cooperative and Macroscopic Charge‐Transfer Phase Transitioncitations
- 2020Landau Theory for Non-Symmetry-Breaking Electronic Instability Coupled to Symmetry-Breaking Applied to Prussian Blue Analoguecitations
- 2018Between single ion magnets and macromolecules : a polymer/transition metal-based semi-solid solutioncitations
- 2015$Fe^{II}$ spin-crossover phenomenon in the pentadecanuclear ${Fe_9[Re(CN)_8]_6}$ spherical clustercitations
- 2008Spectroscopic ellipsometry investigations of the thermally induced first-order transition of RbMn[Fe(CN) 6 ]citations
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article
From Ultrafast Photoinduced Small Polarons to Cooperative and Macroscopic Charge‐Transfer Phase Transition
Abstract
International audience ; We study by femtosecond infrared spectroscopy the ultrafast and persistent photoinduced phase transition of the RbMnCo[Fe(CN)] ⋅ 0.2HO material, induced at room temperature by a single laser shot. This system exhibits a charge-transfer based phase transition with a 75 K wide thermal hysteresis, centred at room temperature, from the low temperature Mn-N-C-Fe tetragonal phase to the high temperature Mn-N-C-Fe cubic phase. At room temperature, the photoinduced phase transition is persistent. However, the out-of-equilibrium dynamics leading to this phase is multi-scale. Femtosecond infrared spectroscopy, particularly sensitive to local reorganizations through the evolution of the frequency of the N-C vibration modes with the different characteristic electronic states, reveals that at low laser fluence and on short time scale, the photoexcitation of the Mn-N-C-Fe phase creates small charge-transfer polarons [Mn-N-C-Fe]* within ≃250 fs. The local trapping of photoinduced intermetallic charge-transfer is characterized by the appearance of a polaronic infrared band, due to the surrounding Mn-N-C-Fe species. Above a threshold fluence, when a critical fraction of small CT-polarons is reached, the macroscopic phase transition to the persistent Mn-N-C-Fe cubic phase occurs within ≃ 100 ps. This non-linear photo-response results from elastic cooperativity, intrinsic to a switchable lattice and reminiscent of a feedback mechanism.