Charge and Structural Dynamics in Photoinduced Phase Transition of (EDO-TTF)2PF6 Examined by Picosecond Time-Resolved Vibrational Spectroscopy

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• 作者：Naoto Fukazawa ; Minoru Shimizu ; Tadahiko Ishikawa ; Yoichi Okimoto ; Shin-ya Koshihara ; Takaaki Hiramatsu ; Yoshiaki Nakano ; Hideki Yamochi ; Gunzi Saito ; Ken Onda
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：March 8, 2012
• 年：2012
• 卷：116
• 期：9
• 页码：5892-5899
• 全文大小：424K
• 年卷期：v.116,no.9(March 8, 2012)
• ISSN：1932-7455

文摘

Using time-resolved near-infrared reflectance spectroscopy and time-resolved mid-infrared vibrational spectroscopy, we studied photoinduced phase transition of the charge-ordered insulating phase in a charge-transfer complex (EDO-TTF)₂PF₆ (EDO-TTF: ethylenedioxy-tetrathiafulvalene) in the hundred picosecond range after photoexcitation. The temporal profiles at 0.83鈥?.03 eV, which are a characteristic of the photoinduced charge-disproportionate phase immediately after photoexcitation, suggested the formation of a new metastable phase in the hundred picosecond range. Time-resolved vibrational spectra at 1300鈥?700 cm^鈥?, where charge- and structure-sensitive C鈺怌 stretching vibrational modes are located, elucidated that the nature of the new phase is very close to that of the high-temperature metallic phase and it takes about 100 ps for the new phase to emerge accompanied with charge and structure fluctuation.