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Shifting photo-stationary light-induced excited spin state trapping equilibrium towards higher temperature by increasing light fluence

Abstract : The Light-Induced Excited Spin-State Trapping (LIESST) process allows tuning the electronic state of spin-crossover materials from low (LS) to high spin (HS) states. The photoinduced HS state is long-lived, up to a characteristic temperature, T(LIESST), above which the system relaxes rapidly to the LS state. We study the effect of light irradiance on competing LS→HS up-conversion and HS→LS thermal relaxation on the [Fe(phen)2(NCS)2] system. Raman spectroscopy and magnetic measurements are used to investigate this phenomenon. An empiric model describes the competition between up conversion and thermal relaxation mechanisms and the stabilization of photo-stationary state towards higher temperature.
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https://hal.archives-ouvertes.fr/hal-03564031
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Submitted on : Thursday, February 10, 2022 - 10:26:14 AM
Last modification on : Wednesday, April 27, 2022 - 4:59:10 AM
Long-term archiving on: : Wednesday, May 11, 2022 - 6:19:39 PM

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Lucas Gournay, Ievgeniia F Chaban, Jean-yves Mevellec, Bernard Humbert, Etienne Janod, et al.. Shifting photo-stationary light-induced excited spin state trapping equilibrium towards higher temperature by increasing light fluence. Chemical Physics Letters, Elsevier, 2022, 791, 139395 (6 p.). ⟨10.1016/j.cplett.2022.139395⟩. ⟨hal-03564031⟩

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