| Project/Area Number |
15GS0216
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| Research Category |
Grant-in-Aid for Creative Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Institution | Tohoku University (2004-2007)
Tokyo Metropolitan University (2003) |
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Principal Investigator |
YAMASHITA Masahiro Tohoku University, Graduate School of Science, Professor (60167707)
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| Co-Investigator(Kenkyū-buntansha) |
YONEMITSU Kenji National Institutes of Natural Science, Institute for Molecular Science, Associate Professor (60270823)
OKAMOTO Hiroshi The University of Tokyo, Graduate School of Frontier Science, Professor (40201991)
KATO Masako Hokkaido University, Graduate School of Science, Professor (80214401)
宮坂 等 東北大学, 大学院・理学研究科, 准教授 (50332937)
高石 慎也 東北大学, 大学院・理学研究科, 助教 (10396418)
杉浦 健一 首都大学東京, 都市教養学部, 教授 (60252714)
岩崎 賢太郎 千葉大学, 工学部, 助手 (00251182)
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| Project Period (FY) |
2003 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥396,630,000 (Direct Cost: ¥305,100,000、Indirect Cost: ¥91,530,000)
Fiscal Year 2007: ¥74,100,000 (Direct Cost: ¥57,000,000、Indirect Cost: ¥17,100,000)
Fiscal Year 2006: ¥75,790,000 (Direct Cost: ¥58,300,000、Indirect Cost: ¥17,490,000)
Fiscal Year 2005: ¥77,480,000 (Direct Cost: ¥59,600,000、Indirect Cost: ¥17,880,000)
Fiscal Year 2004: ¥78,390,000 (Direct Cost: ¥60,300,000、Indirect Cost: ¥18,090,000)
Fiscal Year 2003: ¥90,870,000 (Direct Cost: ¥69,900,000、Indirect Cost: ¥20,970,000)
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| Keywords | Third-Order Optical Nonlinearity / Strong Electron Correlation / Electron-Phonon Interaction / Peierls Transition / Nano-Wire / Mott-Insulator / Fastener Effect / Ultra-Fast Optical Communication / 電荷密度波状態 / モット絶縁体状態 / 相転移 / 光誘起相転移 / 化学的圧力 / ナノワイヤー金属錯体 / 混合原子価錯体 / 平均原子価錯体 / 非線形光学材料 / スピンコート法 / 高速光通信 / 一次元金属錯体 / 非線形光学効果 / STM / バンド絶縁体 / パイエルス絶縁体 / ソリトン |
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| Research Abstract |
Quasi-one-dimensional halogen-bridged Pd compounds take a Pd(II)-Pd(IV) mixed-valence state or charge-density-wave state or Peierls Insulator due to the electron-phonon interaction. In order to realize a Pd(III) Mott-Insulator we used the sulphonic acid counter anions with long alkyl chains. In the raw of the five alkyl chain, the Pd compound shows the phase transition from the Pd(II)-Pd(IV) Peierls Insulator into the Pd(III) Mott-Insulator about 200K with hysteresis, which is the inverse Peierls transition. This phenomena were evidenced by ESR, X-ray single-crystal analyses, single-crystal reflection spectra, electrical conductivities, etc. In the case of the ten and twelve alkyl chains, the Pd(III) Mott-insulators are the ground state even in mom temperature, which is the first example. These interesting phenomena are well explained by the fastener effect or chemical pressure of the long alkyl chains. In the Pd(III) Mott-Insulator at 15 K the photo-irradiation with the energy of the charge transfer band (0.5eV) produced the Pd(II)-Pd(IV) Peierls Insulator state, while the photo-irradiation with L5 eV produced the metallic state. Such photo-induced phase transitions occurred in femto-seconds, which are available for the ultra-fast optical communication.
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