Study of the charge ordering in organic conductors

有机导体中电荷有序性的研究

基本信息

  • 批准号:
    13440214
  • 负责人:
  • 金额:
    $ 2.69万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    2001
  • 资助国家:
    日本
  • 起止时间:
    2001 至 2003
  • 项目状态:
    已结题

项目摘要

The charge ordering in organic conductors originates from a very narrow bandwidth. We have observed the charge distribution using charge-sensitive intra-molecular vibrational modes. In this research project, we have achieved the following results. (1) The response of the Raman-active charge-sensitive mode is not so simple as it was expected in the first stage. Based on the theoretical calculation, we elucidated how the vibronic bands split depending upon the magnitude of the a-mv (electron-molecular vibration) coupling constant when the system undergoes a charged-ordered state. We found that in the charge-transfer salts of BEDT-TTF, the weakly coupled ν_2 mode was useful for estimating the disproportionation ratio and the strongly coupled ν_3 mode was useful for obtaining the symmetry of the ordered-charge pattern. (2) We found a vertical stripe in θ-(BDT-TTF)_2Cu(NCS)_2 and a diagonal stripe in θ-(BEDT-TTF)_2TlZn(SCN)_4 in addition to the horizontal stripe in θ-(BEDT-TTF)_RbZn(SCN)_4. These findings support the theoretical prediction that the actual materials are located near the boundary among these stripe phases. (3) The electronic phase diagram of θ-type BEDT-TTF salts was systematically studied. The low-temperature insulating phase of θ-type BEDT-TTF salts was identified as the charge-ordered state. We suggested through the Raman spectra that the high-temperature conducting phase is not a coherent metallic state but a non-metallic state in which the charge carriers are hopping incoherently. The hopping rate increases as the dihedral angle between adjacent BEDT-TTF molecules decreases. θ-(BEDT-TTF)_2CsZn(SCN)_4 is located at the boundary which separates the insulating and metallic (or superconducting) phase. We found that the insulating phase of this compound is not a charge-ordered state but a weakly localized state. (4) We have verified that the phase transitions of β''-(BEDT-TTF)_3X_2 (X=ReO_4, ClO_4, and HSO_4) are accompanied by charge ordering.
有机导体中的电荷有序化起源于一个非常窄的带宽。我们已经观察到的电荷分布使用电荷敏感的分子内振动模式。在本研究项目中,我们取得了以下成果。(1)拉曼活性电荷敏感模式的响应并不像第一阶段所预期的那样简单。基于理论计算,我们阐明了当系统处于荷电有序态时,电子振动带如何随a-mv(电子-分子振动)耦合常数的大小而分裂。我们发现在BEDT-TTF的电荷转移盐中,弱耦合的ν_2模有助于估算电荷转移比,而强耦合的ν_3模有助于获得有序电荷图案的对称性。(2)在θ-(BDT-TTF)_2Cu(NCS)_2中发现了一条垂直条纹,在θ-(BEDT-TTF)_2TlZn(SCN)_4中发现了一条斜条纹,在θ-(BEDT-TTF)_RbZn(SCN)_4中发现了一条水平条纹。这些发现支持了理论预测,即实际材料位于这些条纹相之间的边界附近。(3)系统地研究了θ型BEDT-TTF盐的电子相图。θ型BEDT-TTF盐的低温绝缘相为电荷有序态。通过拉曼光谱,我们认为高温导电相不是相干金属态,而是载流子非相干跳跃的非金属态。随着相邻BEDT-TTF分子之间二面角的减小,跳跃速率增加。θ-(BEDT-TTF)_2CsZn(SCN)_4位于绝缘相和金属相(或超导相)的分界线上。我们发现该化合物的绝缘相不是电荷有序态,而是弱定域态。(4)我们证实了X ″-(BEDT-TTF)_3X_2(X=ReO_4,ClO_4,HSO_4)的相变伴随着电荷有序化。

项目成果

期刊论文数量(248)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
T.Yamamoto, H.Tajima, R.Kato, M.Uruichi, K.Yakushi: "Raman spectra of (Me_2-DCNQI)_2CuxLi_<1-x> (0<x<1). The evidence of charge separation at room temperature in a one-dimensional conductor having a quarter filled band"J.Phys.Soc.Jpn.. 71. 1956-1964 (2002
T.Yamamoto、H.Tajima、R.Kato、M.Uruichi、K.Yakushi:“(Me_2-DCNQI)_2CuxLi_<1-x> (0<x<1) 的拉曼光谱。室温下电荷分离的证据
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R.Wojciechowski, K.Yamamoto, K.Yakushi, M.Inokuchi, A.Kawamoto: "High-pressure Raman study of the charge ordering in α-(BEDT-TTF)_2I_3"Phys.Rev.B. 67. 224105(11) (2003)
R.Wojciechowski、K.Yamamoto、K.Yakushi、M.Inokuchi、A.Kawamoto:“α-(BEDT-TTF)_2I_3 中电荷排序的高压拉曼研究”Phys.Rev.B. 11) (2003)
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O.Drozdova, K.Yakushi, H.Yamochi, G.Saito, D.B.Tanner: "Infrared study of the properties of the normal (metallic) phase of κ-(ET-^<13>C_4)_2Cu(CN)[N(CN)_2]"Synthetic Metals. 133-134. 119-121 (2003)
O.Drozdova、K.Yakushi、H.Yamochi、G.Saito、D.B.Tanner:“κ-(ET-^<13>C_4)_2Cu(CN)[N”正相(金属)相特性的红外研究(CN)_2]《合成金属. 133-134. 119-121 (2003)
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O.Drozdova, K.Yakushi, A.Ota, H.Yamochi, G.Saito: "Spectroscopic study of the [0110] charge ordering in (EDO-TTF)_2PF_6"Synthetic Metals. 133-134. 277-279 (2003)
O.Drozdova、K.Yakushi、A.Ota、H.Yamochi、G.Saito:“(EDO-TTF)_2PF_6 中 [0110] 电荷排序的光谱研究”合成金属。
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P.Toman, S.Nespurek, K.Yakushi: "Quantum chemical study of oxidation processes in metal-phthalocyanines"Macromolecular Symposia. (to be published).
P.Toman、S.Nespurek、K.Yakushi:“金属酞菁氧化过程的量子化学研究”高分子研讨会。
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YAKUSHI Kyuya其他文献

YAKUSHI Kyuya的其他文献

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{{ truncateString('YAKUSHI Kyuya', 18)}}的其他基金

Study on the charge fluctuation in molecular conductors
分子导体中电荷涨落的研究
  • 批准号:
    22550134
  • 财政年份:
    2010
  • 资助金额:
    $ 2.69万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Study of the charge-transfer salts with inhomogeneous electronic structure focusing on a charge-order system
以电荷有序系统为中心的非均匀电子结构电荷转移盐的研究
  • 批准号:
    19350074
  • 财政年份:
    2007
  • 资助金额:
    $ 2.69万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Study of the π-d system involving phthalocyanine conductors
酞菁导体π-d体系的研究
  • 批准号:
    09440244
  • 财政年份:
    1997
  • 资助金额:
    $ 2.69万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B).
Japan-CIS joint project for optical studies of new materials
日本-CIS新材料光学研究联合项目
  • 批准号:
    05044066
  • 财政年份:
    1993
  • 资助金额:
    $ 2.69万
  • 项目类别:
    Grant-in-Aid for international Scientific Research

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无序杂质系统中金属-绝缘体转变的关键现象:自旋和补偿的影响
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    22K03449
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    19F19057
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    2019
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相关分子诱导的异常金属-绝缘体转变
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