期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 82, 期 3, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.82.033601
关键词
photoinduced phase transition; time-resolved XAFS; Prussian blue analogue
资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan [21244052]
- Grants-in-Aid for Scientific Research [21244052] Funding Source: KAKEN
Photoinduced dynamics in thin film of cobalt hexacyanoferrate, Na0.79Co[Fe(CN)(6)](0.90)2.9H(2)O, 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+ (similar to 0.007/Co site). The decay time (tau(decay)) of HS Co2+ is 32 ns, while the formation time is within the time resolution (<= 100 ps). Such a long decay time suggests photoinduced phase transition (PIPT) into a hidden metastable phase.
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