DYNAMICS OF SOLITONS AND POLARONS IN QUASI-ONE-DIMENSIONAL HALOGEN-BRIDGED MIXED-VALENCE COMPOUNDS

准一维卤桥混价化合物中孤子和极化子的动力学

• 批准号: 06453047
• 负责人: YAMASHITA Masahiro
• 金额: $ 4.29万
• 依托单位: NAGOYA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06453047/
• 关键词: quasi-one-dimensional compounds; mixed-valence compounds; charge density wave; solitons and polarons; photo-induced absorption; 混合原子価錯体; ハロゲン架橋金属錯体

The effects of the electron-lattice coupling and the interchain interaction on the gap states in the one-dimensional Peierls-Hubbard system have been investigated by the photo-induced absorption (PA) measurements of the halogen-bridged metal complexes (the MX chains ; M=Pt and X=Cl, Br or I). In the complexes having small amplitude of CDW,three PA bands named al, a2, and b are observed. The PA bands a1 and a2, which are insensitive to the interchain interation, are assigned to polarons. The decrease of the interchain coupling of CDW leads to a midgap band b, which is attributable to charged-solitons, While, in the complexes having large amplitude of CDW,there are observed the two PA bands A and B having the long life time. Spectral shapes and excitation profiles of these PA bands are considerebly different from those of the al, a2, and b bands. These results suggestthat generation processes and stabilization energies of the gap states are strongly dependent on the magnitude of electron-lattice interactions.

通过光诱导的吸收（PA）测量值，已经研究了电子晶体耦合和链链相互作用对一维PEIERLS-HUBBARD系统中间隙状态的影响（MX链； MX链； m = pt和x = cl，br或i）。在具有较小CDW幅度的复合物中，观察到三个名为Al，A2和B的PA波段。对链链相互作用不敏感的PA频带A1和A2分配给极性子。 CDW的链链耦合的减小导致Midgap带B，这归因于带电的solitons，而在具有较大CDW幅度的复合体中，观察到了两个PA频段A和B具有较长寿命。这些PA频段的光谱形状和激发曲线与AL，A2和B频段的频谱形状和激发曲线不同。这些结果表明，间隙状态的生成过程和稳定能在很大程度上取决于电子静态相互作用的幅度。

项目成果

R.IKEDA et al.: "Electron Spin Dynamics in the New Halogen-Bridged One-Dimensioncl Complex,Ni_2 (CH_3CS_2)_4 I Studied by 'H NMR" Synth.Met.,. 71. 1907-1908 (1995)

R.IKEDA 等人：“通过 H NMR 研究的新型卤素桥一维复合物 Ni_2 (CH_3CS_2)_4 中的电子自旋动力学”Synth.Met.,。

Y.WADA et al.: "Optical Properties of Quasi-One-Dimensional MMX-Chain Compounds : R_4[P_<+2> (pop)_4×1・nH_2O (R=K and NH_4 ; X=Cl and Br)" Synth.Met.,. 70. 1195-1196 (1995)

Y.WADA等人：“准一维MMX链化合物的光学性质：R_4[P_<+2>(pop)_4×1·nH_2O（R=K和NH_4；X=Cl和Br）”合成学报，70。1195-1196（1995）

M.YAMASHITA: "Haldane Gap System : Structure and Magnetic Propertis of Azido-Bridgel Nickel Complex" Synth.Met.,. 71. 1961-1964 (1195)

M.YAMASHITA：“Haldane 间隙系统：叠氮基-Bridgel 镍络合物的结构和磁性”Synth.Met.,。

N.Kuroda et al.: "Role of Quantum Fluctuations in the Temperature Dependence of Intragap Absorption in a MX Chain Complex" Physical Review B. 50. 8063-8066 (1994)

N.Kuroda 等人：“MX 链复合物中间隙内吸收的温度依赖性中量子涨落的作用”物理评论 B.50.8063-8066 (1994)

M.YAMASHTA et al: "Low-Dimensional Magnetic Systems with S=1,3/2 and 2" Mol.Cryst.Lig.Cryst.,. 274. 25-32 (1995)

M.YAMASHTA 等人：“S=1,3/2 和 2 的低维磁系统”Mol.Cryst.Lig.Cryst.,。