Charge and structural dynamics in photoinduced phase transition of (EDO-TTF) 2PF 6 examined by picosecond time-resolved vibrational spectroscopy

Naoto Fukazawa, Minoru Shimizu, Tadahiko Ishikawa, Yoichi Okimoto, Shin Ya Koshihara, Takaaki Hiramatsu, Yoshiaki Nakano, Hideki Yamochi, Gunzi Saito, Ken Onda

研究成果: Contribution to journalArticle

20 被引用数 (Scopus)

抄録

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) 2PF 6 (EDO-TTF: ethylenedioxy- tetrathiafulvalene) in the hundred picosecond range after photoexcitation. The temporal profiles at 0.83-1.03 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 1300-1700 cm -1, where charge- and structure-sensitive C=C 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.

本文言語英語
ページ(範囲)5892-5899
ページ数8
ジャーナルJournal of Physical Chemistry C
116
9
DOI
出版ステータス出版済み - 3 8 2012
外部発表はい

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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