Reflectance Spectra of κ-(BEDT-TTF)2I3:Electronic Structure of Dimeric BEDT-TTF Salts
Reflectance Spectra of κ-(BEDT-TTF)2I3:Electronic Structure of Dimeric BEDT-TTF Salts
复制标题
κ-(BEDT-TTF)2I3 的反射光谱：二聚 BEDT-TTF 盐的电子结构
DOI：
10.1143/jpsj.60.3861
复制
发表时间：
1991
影响因子：
1.7
通讯作者：
H. Kobayashi
中科院分区：
文献类型：
--
作者：
M. Tamura;H. Tajima;K. Yakushi;H. Kuroda;A. Kobayashi;R. Kato;H. Kobayashi
测量了295K和15K下κ-(BEDT-TTf)2 I3单晶在5 0 0 cm-1~25000 cm-1范围内的偏振反射光谱。红外性质是二维的。尽管具有金属直流电导率，但仍观察到非德鲁德中红外特征。与β-和θ-(BEDT-TTf)2 I3的比较表明，这一行为与κ-盐的二聚体结构密切相关。对观测到的线形进行了曲线拟合分析，得到了光学有效质量。在微扰理论的基础上，推导了κ-盐的有效紧束缚带模型。我们利用该模型估计了传递积分。
Polarized reflectance spectra of a single crystal of κ-(BEDT-TTF) 2 I 3 were measured at 295 K and 15 K over the spectral range from 500 cm -1 to 25000 cm -1 . The infrared property was two-dimensional. Non-Drude mid-infrared features were observed in spite of the metallic dc conductivity. A comparison with β- and θ-(BEDT-TTF) 2 I 3 shows that this behavior has a close connection with the dimeric structure of κ-salts. We analyzed the observed line shape by the curve-fitting analysis, and obtained optical effective masses. On the basis of the perturbation theory, an effective tight-binding band model for κ-salt was derived. We estimated the transfer integrals using this model.