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Abstract
Photoinduced dynamics in thin film of cobalt hexacyanoferrate, Na0.79Co[Fe(CN)6]0.902.9H2O, was investigated by time-resolved X-ray absorption fine structure (XAFS) spectroscopy around the Co K edge at 300 K. The compound remains in the low-spin (LS) phase with the electronic configuration of LS Co3+–LS Fe2+ up to 500 K. Nevertheless, the differential XAFS spectrum indicates the formation of high-spin (HS) Co2+ (\({\sim}0.007\)/Co site). The decay time (τdecay) of HS Co2+ is 32 ns, while the formation time is within the time resolution (\({\leq}100\) ps). Such a long decay time suggests photoinduced phase transition (PIPT) into a hidden metastable phase.
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