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Title
Japanese:Optical Study of Electronic Structure and Photoinduced Dynamics in the Organic Alloy System [(EDO-TTF)0.89(MeEDO-TTF)0.11]2PF6 
English:Optical Study of Electronic Structure and Photoinduced Dynamics in the Organic Alloy System [(EDO-TTF)0.89(MeEDO-TTF)0.11]2PF6 
Author
Japanese: 石川 忠彦, 卜澤 陽平, 進藤 泰貴, 沖本 洋一, 腰原 伸也, Seiichi Tanaka, 恩田 健, Takaaki Hiramatsu, 中野 義明, Koichiro Tanaka, Hideki Yamochi.  
English: Tadahiko Ishikawa, Yohei Urasawa, Taiki Shindo, Yoichi Okimoto, Shin-ya Koshihara, Seiichi Tanaka, Ken Onda, Takaaki Hiramatsu, Yoshiaki Nakano, Koichiro Tanaka, Hideki Yamochi.  
Language English 
Journal/Book name
Japanese:Applied Sciences 
English:Applied Sciences 
Volume, Number, Page Vol. 9    No. 6    p. 1174
Published date Mar. 2019 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://dx.doi.org/10.3390/app9061174
 
DOI https://doi.org/10.3390/app9061174
Abstract <jats:p>Over the past two decades (EDO-TTF)2PF6 (EDO-TTF = 4,5-ethylenedioxytetrathiafulvalene), which exhibits a metal–insulator (M–I) phase transition with charge–ordering (CO), has been investigated energetically because of attractive characteristics that include ultrafast and massive photoinduced spectral and structural changes. In contrast, while its crystal structure has much in common with the (EDO-TTF)2PF6 crystal, the organic alloy system of [(EDO-TTF)0.89(MeEDO-TTF)0.11]2PF6 (MeEDO-TTF = 4,5-ethylenedioxy-4′-methyltetrathiafulvalene) exhibits a quite different type of M–I phase transition that is attributed to Peierls instability. Here, an optical study of the static absorption spectra and the time-resolved changes in the absorption spectra of [(EDO-TTF)0.89(MeEDO-TTF)0.11]2PF6 are reported. The observed absorption spectra related to the electronic structure are highly anisotropic. With a reduction in temperature (T), the opening of a small optical gap and a small shift in the center frequency of the C=C stretching mode are observed along with the M–I phase transition. Additionally, photoinduced transient states have been assigned based on their relaxation processes and transient intramolecular vibrational spectra. Reflecting small valence and structural changes and weak donor–anion interactions, a photoinduced transient state that is similar to the thermal-equilibrium high-T metallic phase appears more rapidly in the alloy system than that in (EDO-TTF)2PF6.</jats:p>

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