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首页> 外文期刊>Physical review >Terahertz responses of the high-temperature metallic phase and photoinduced metallic state in the ferroelectric charge-ordered organic salt α-(ET)_2I_3
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Terahertz responses of the high-temperature metallic phase and photoinduced metallic state in the ferroelectric charge-ordered organic salt α-(ET)_2I_3

机译：铁电有序有机盐α-（ET）_2I_3中高温金属相和光诱导金属态的太赫兹响应

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摘要

The thermal and photoinduced phase transitions between the ferroelectric charge-ordered (CO) insulator state and the metallic state in the layered organic salt α-(ET)_2I_3 (ET: [bis(ethylenedithio)]-tetrathiafulvalene) were investigated using terahertz time-domain spectroscopy. Characteristic increases were observed in the optical conductivity and the dielectric constant upon increasing the temperature to just below the insulator-to-metal transition temperature (T_(CO)), which reflects the partial or precursory collapse of the ferroelectric state and charge ordering. The excitation of this partially melted CO state near T_(CO) led to the formation of a photoinduced macroscopic metallic state, whose conductivity appeared to be greater than that of a high-temperature metallic state. At T T_(CO), a microscopic metallic state was formed within the rigid CO state.
机译：使用太赫兹时间研究了层状有机盐α-（ET）_2I_3（ET：[双（亚乙基二硫代]]-四硫富瓦烯）中铁电有序（CO）绝缘子状态与金属状态之间的热和光诱导相变。域光谱学。当温度升高到刚好低于绝缘体到金属的转变温度（T_（CO））时，观察到光学导电率和介电常数的特性增加，这反映了铁电态的部分或先驱性崩溃和电荷排序。在T_（CO）附近激发该部分熔融的CO态导致形成光诱导的宏观金属态，其电导率似乎大于高温金属态的电导率。在T ＜＜ T_（CO）时，在刚性CO状态内形成微观金属状态。

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  • 来源
    《Physical review》 |2010年第15期|155111.1-155111.6|共6页
  • 作者

    H. Nakaya; K. Itoh; Y. Takahashi; H. Itoh; S. Iwai; S. Saito; K. Yamamoto; K. Yakushi;

  • 作者单位

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

    rnDepartment of Physics, Tohoku University, Sendai 980-8578, Japan;

    rnDepartment of Physics, Tohoku University, Sendai 980-8578, Japan;

    rnDepartment of Physics, Tohoku University, Sendai 980-8578, Japan JST, CREST, Sendai 980-8578, Japan;

    rnDepartment of Physics, Tohoku University, Sendai 980-8578, Japan JST, CREST, Sendai 980-8578, Japan;

    National Institute of Information and Communications Technology, Kobe 651-2492, Japan;

    rnInstitute for Molecular Science, Okazaki 444-8585, Japan;

    rnInstitute for Molecular Science, Okazaki 444-8585, Japan;

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  • 关键词

    metal-insulator transitions and other electronic transitions; organic superconductors; organic compounds, polymers;

    机译：金属-绝缘体过渡和其他电子过渡;有机超导体;有机化合物;聚合物;

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