Study of Strongly Correlated Electronic System of Low-Dimension in Organic Conductors

有机导体低维强相关电子系统研究

• 批准号: 03302017
• 负责人: KAGOSHIMA Seiichi
• 金额: $ 13.44万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Co-operative Research (A)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03302017/
• 关键词: Organic Conductor; Electron Correlation; Low Dimensional Electronic System; Spin Density Wave; Magnetoresistance; Peierls Instability; 電気伝導; 電荷密度; スピン密度; 価数揺動; 抵次元電子

The purpose of the present study is to clarify effects of the Coulomb correlation among electrons to properties of low-dimensional electronic system in organic conductors.In (BEDT-TTF)_2KHg(SCN)_4 and its family we found a geometrical effect of the two-dimensional Fermi surface to the magnetoresistance. We found also an antiferromagnetic-like state presumably due to instability of another Fermi surface of one-dimension. The anitiferromagnetic state was found to be present at low temperatures below 8 K, under weak magnetic fields below 23 T, and at low pressures below 5 Kbar.In TMTSF salts another geometrical effect to the magneto-resistance was found. In addition we presented answers to questions about puzzling properties of the field-induced spin density waves. The high-field limiting state was found to have the quantum number of zero.In DCNQI salts the reentrance transition was investigated in detail. Electronic properties of this class of materials were found to be understood in terms of the Peierls transition in the pi band of DCNQI molecular stacks and the Mott transition in the d band due to copper ions.In conclusion one can say that all factors of low-dimensionality, the electron correlation, the electron-phonon interaction, and weak three-dimensionality play essential roles in electronic properties of these materials.

在（BEDT-TTF）_2KHg（SCN）_4及其族中，我们发现二维费米面的几何效应对磁电阻的影响。我们还发现了一个类似反铁磁的状态，推测是由于另一个一维费米面的不稳定性。在低于8 K的低温、低于23 T的弱磁场和低于5 Kbar的低压下发现了反铁磁态，在TMTSF盐中发现了磁电阻的另一种几何效应，并对场致自旋密度波的一些令人困惑的性质提出了解答.发现高场极限态的量子数为零。详细研究了DCNQI盐的重入跃迁。这类材料的电子性质可以用DCNQI分子堆π带的Peierls跃迁和铜离子引起的d带的Mott跃迁来理解，可以说低维性、电子关联、电子-声子相互作用和弱三维性等因素对这类材料的电子性质起着至关重要的作用。

项目成果

T.Osada, S.Kagoshima,and N.Miura: "FIELD-INDUCED SPIN-DENSITY-WAVE INSTABILETY OF THE ANISOTROPIC TWO-DI,ENSIONAL ELECTRON SYSTEM INDER LATRERAL SIPERLATTICE POTENTEAL" Phtsical Review Letters. 69. 1117-1120 (1992)

T.Osada、S.Kagoshima 和 N.Miura：“横向 SIPERLATTICE POTENTEAL 下各向异性二元电子系统的场致自旋密度波不稳定性”物理评论快报。

T.Sasaki, N.toyota: "Magnetic Phase Diagran of the Organic Conductor α-(BEDT-TTG)_2KHg(SCN)_4" Solid State Commun.82. 447-451 (1992)

T.Sasaki，N.toyota：“有机导体 α-(BEDT-TTG)_2KHg(SCN)_4 的磁相图”Solid State Commun.82 (1992)。

J.Brooks,C.Agosta,S.Klepper 徳本圓、木下信盛、安西弘行 宇治伸也、青木晴善、A.Perel G.Athas,D.Howe: "Novel Interplay of Fermi-Surface Bahavior and Magnetism in a Low-Dimensionl Organic Conductor" Phys. Rev. Letters. 69. 156-159 (1992)

J. Brooks、C. Agosta、S. Klepper En Tokumoto、Nobumori Kinoshita、Hiroyuki Anzai Shinya Uji、Haruyoshi Aoki、A. Perel G. Athas、D. Howe：“低-费米表面行为与磁力的新颖相互作用”维度有机导体”物理修订快报 69. 156-159 (1992)

K.Kanoda, et al.: "Magnetic Penetration Depth of the κ-Phase Family of Organic Superconductors" Synth. Met.

K.Kanoda 等人：“有机超导体 κ 相族的磁穿透深度”Synth。

K.Oshima, et al.: "XANES and EXAFS Study in(R_1R_2-DCNQI)_2Cu" JPN.J.Appl.Phys.

K.Oshima 等人：“(R_1R_2-DCNQI)_2Cu 中的 XANES 和 EXAFS 研究”JPN.J.Appl.Phys。