Low temperature superstructure and transfer integrals in κ-(BEDT-TTF)2Cu[N(CN)2]X : X = Cl, Br

被引：21
|
作者：
Watanabe, M
Nogami, Y
Oshima, K
Ito, H
Ishiguro, T
Saito, G
机构：
[1] Okayama Univ, Dept Phys, Okayama 7008530, Japan
[2] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan
[3] Kyoto Univ, Dept Chem, Kyoto 6068502, Japan
来源：
SYNTHETIC METALS | 1999年 / 103卷 / 1-3期
关键词：
X-ray emission; diffraction and scattering; structural phase transitions; organic superconductors;
D O I：
10.1016/S0379-6779(98)00615-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Low temperature crystal structures and band parameters were presented for the deuterized (d) and the hydrogenized (h) kappa - (BEDT-TTF)2Cu[N(CN)2]Cl and for deuterized kappa-(BEDT-TTF)2Cu[N(CN)2]Br. An enhanced molecular dimerization was observed for the Cl salts. Theoretical prediction by H. Kino and H. Fukuyama that the molecular dimerization stabilizes the Mott insulating state was confirmed. Below 200 K, X-ray diffuse scattering study revealed formation of two dimensional ax2c superstructure in the deuterized kappa -(BEDT-TTF)2CU[N(CN)2]Br. The structural disorder for the d-Br salt was observed in the superstructure and in the terminal ethylenes.
引用
收藏
页码：1909 / 1910
页数：2
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