Charge-ordering in θ -(BEDT-TTF){2}MM^prime (SCN){4} [ M = Cs, Rb, Tl, M^prime = Zn, Co]
Abstract
Vibrational spectra, x-ray scattering and electrical resistivity of θ -(BEDT-TTF){2}MM^prime (SCN){4}, [ M = Cs, Rb, Tl, M^prime = Zn, Co] were measured in various temperature ranges. Vibrational spectra with the aid of x-ray scattering manifested charge disproportionation and charge ordering in their low-temperature phases. Except θ -(BEDT-TTF){2}CsM^prime (SCN){4}, the orthorhombic form provided a horizontal stripe. On the other hand, monoclinic θ -(BEDT-TTF){2}TlZn(SCN){4} provided a diagonal stripe. The electronic state of the high-temperature phase is discussed based on the line shape of the Raman spectrum. Key words. Charge-ordering, BEDT-TTF, Raman spectroscopy, infrared spectroscopy.
- Publication:
-
Journal de Physique IV
- Pub Date:
- April 2004
- DOI:
- 10.1051/jp4:2004114089
- Bibcode:
- 2004JPhy4.114..379S