Far-infrared study of the insulator-metal transition in θ-(BEDT-TTF)₂RbZn(SCN)₄
Wang, N. L. · Mori, H. · Tanaka, S. · Dong, J. · Clayman, B. P.
Original · EN
The temperature-dependent infrared properties of θ-(BEDT-TTF)₂RbZn(SCN)₄ were investigated. In the temperatures above the metal-insulator (M-I) transition, the optical conductivity remains finite in the low energy region, but shows no conventional Drude feature typical of metals. Below the M-I transition temperature, the low-energy spectral weight is significantly reduced. An opening of optical gap at about 300 cm⁻¹ is observed clearly in the polarization parallel to the donor-stacking direction. Analysis of both the electronic and vibronic spectra suggests a redistribution of charges in ET molecules as temperature decreases across the M-I transition, providing strong support for the charge-ordering state at low temperatures.
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