Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 13, Issue 23, Pages 5463-5470Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/13/23/305
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We investigated the temperature-dependent infrared properties of the compound theta-(BEDT-TTF)(2)RbZn(SCN)(4). At temperatures above the metal-insulator transition, the optical conductivity remains finite in the low-energy region, but shows no conventional Drude feature typical of metals. Below the metal-insulator transition temperature, the low-energy spectral weight is significantly reduced. The opening of an optical gap at about 300 cm(-1) is observed clearly in polarization parallel to the donor stacking direction. Analysis of both the electronic and vibronic spectra suggests a redistribution of charges in BEDT-TTF molecules as temperature decreases across the metal-insulator transition, providing strong support for a charge-ordering state at low temperatures.
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