ELECTRON-MOLECULAR VIBRATIONAL COUPLING AND ELECTRONIC STRUCTURE OF κ-(BEDT-TTF)_2CuN(CN)_2Cl_(0.5)Br_(0.5): OPTICAL STUDY AT TEMPERATURES DOWN TO 15 K.

摘要

Our analysis shows that both localized and delocalized charge carriers are involved in the linear EMV coupling and therefore contribute to the optical conductivity. The part of the optical conductivity, which is due to delocalized electrons, grows with temperature decrease. The EMV coupling parameters remain constant in the whole investigated temperature range. This approach may be useful for a quantitative analysis of the reflectance data of other ET salts: superconductor K-(ET)2Cu[N(CN)2]Br [7] and conductor κ-(ET)2Cu[N(CN)2]Cl [8]. This work was supported by RFFI 00-02-04019 and DFG-a grants.