Single laser shot photoinduced phase transition of rubidium manganese hexacyanoferrate investigated by X-ray diffraction

Abstract : We study by X-ray diffraction the phase transition of microcrystals of rubidium manganese hexacyanoferrate, for which combined electron transfer and structural reorganization are responsible for a change of magnetic properties. The Rb0.94Mn[Fe(CN)6]0.98•2.5H2O system undergoes a phase transition between the tetragonal phase Fe II (S=0)-CN-Mn III (S=2) and the cubic Fe III (S=1/2)-CN-Mn II (S=5/2) phases. The thermal equilibrium phase transition shows a broad regime of bistability, responsible for the appearance of a thermal hysteresis in the  185-300 K temperature range. We used a deposited film to study by X-ray diffraction the switching from the tetragonal phase to the cubic phase, induced inside the thermal hysteresis by a single laser shot of tunable power. Compared to previous measurements using local probes, our results show that the ns laser pulse induces a stable long-range ordered cubic phase when conversion is partial or complete.
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Submitted on : Wednesday, February 13, 2019 - 8:46:06 AM
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Giovanni Azzolina, Eric Collet, Céline Mariette, Marco Cammarata, Elzbieta Trzop, et al.. Single laser shot photoinduced phase transition of rubidium manganese hexacyanoferrate investigated by X-ray diffraction. European Journal of Inorganic Chemistry, Wiley-VCH Verlag, 2019, ⟨10.1002/ejic.201801478⟩. ⟨hal-02017137⟩

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