LOW-FREQUENCY RAMAN-SPECTRA IN KAPPA-(BEDT-TTF)(2)CU(NCS)(2) AND KAPPA-(BEDT-TTF)(2)CU[N(CN)(2)]BR

被引：4
|
作者：
SEKINE, T
OHMAMIUDA, A
TANOKURA, Y
SAITO, G
IKEDA, K
NAKAMURA, T
TAKAHASHI, T
机构：
[1] KYOTO UNIV,DEPT CHEM,SAKYO KU,KYOTO 606,JAPAN
[2] GAKUSHUIN UNIV,DEPT PHYS,TOSHIMA KU,TOKYO 171,JAPAN
来源：
SYNTHETIC METALS | 1995年 / 70卷 / 1-3期
关键词：
D O I：
10.1016/0379-6779(94)02728-H
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The ordering of the terminal ethylene groups of the BEDT-TTF molecule, i.e., the staggered or eclipsed conformation, in kappa-(BEDT-TTF)(2)Cu(NCS)(2) and kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br was studied between 18 and 295 K by Raman scattering. The low-frequency spectra of these compounds are similar to each other. Broad peaks at about 55 cm(-1) extremely broadened and their intensities became weak with decreasing temperature. The anomalous behaviour was interpreted in terms of critical dynamics of the pseudospin-phonon coupled system, where the spin states represent the conformations of the terminal ethylene groups. It was found that the ordered state is formed around the superconducting critical temperature.
引用
收藏
页码：981 / 982
页数：2
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