Charge Fluctuations and Ethylene-Group-Ordering Transition in β"-(BEDT-TTF)4[(H3O)Fe(C2O4)3]•Y Molecular Charge-Transfer Salts

被引：5
|
作者：
Olejniczak, Iwona [1 ]
Frackowiak, Arkadiusz [1 ]
Swietlik, Roman [1 ]
Prokhorova, Tatiana G. [2 ]
Yagubskii, Eduard B. [2 ]
机构：
[1] Polish Acad Sci, Inst Mol Phys, PL-60179 Poznan, Poland
[2] Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, MD, Russia
来源：
CHEMPHYSCHEM | 2013年 / 14卷 / 17期
关键词：
charge transfer; IR spectroscopy; layered compounds; Raman spectroscopy; superconductors; BEDT-TTF SALTS; ORGANIC CONDUCTORS; ELECTRONIC-PROPERTIES; PHYSICAL-PROPERTIES; OPTICAL-PROPERTIES; GUEST MOLECULES; SUPERCONDUCTOR; CONDUCTIVITY; SPECTRA; FE;
D O I：
10.1002/cphc.201300754
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The polarized infrared reflectance and Raman spectra of the three quasi-two-dimensional -(BEDT-TTF)(4)[(H3O)Fe(C2O4)(3)]Y bifunctional charge-transfer salts, where BEDT-TTF=bis(ethylenedithio)tetrathiafulvalene and Y=C6H5Br, (C6H5CN)(0.17)(C6H5Br)(0.83), (C6H5CN)(0.4)(C6H5F)(0.6), have been measured as a function of the temperature. Signatures of charge inhomogenity have been found in both Raman and infrared spectra of the -(BEDT-TTF)(4)[(H3O)Fe(C2O4)(3)]Y superconductors. A 100 K transition to a mixed insulating/metallic state is clearly seen for the first time in the temperature dependence of the electronic spectra of superconducting -(BEDT-TTF)(4)[(H3O)Fe(C2O4)(3)]C6H5Br. We suggest that this phase transition is due to subtle changes in the ethylene groups ordering, which are related to a structural phase transition in the anionic layer. The infrared and Raman spectra of quasi-two-dimensional metal -pseudo--(BEDT-TTF)(4)[(H3O)Fe(C2O4)(3)]C6H4Br2 are also investigated.
引用
收藏
页码：3925 / 3935
页数：11
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