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Free keywords:
complex compounds | electrial properties | iodine doping | microwave conductivity | organicconductor | superconductivity
Abstract:
The microwace conductivity in dependence of temperature was measured on pure and iodine doped crystals of α-(BEDT-TTF)2I3 along the stack direction [100] and perpendictular to it [010]. The exposure times to iodine were varied in many steps between 2 min and 360 min. The contacltess microwave technique enables to keep the same crystal in ech case throuhout all measurements. - The results show that the microwave conductivity vs. temperature is not influenced distinctly by iodine doping. Only alt the onset of the plateau range immediately belwo the metal-ionisator transition ant 135 K a small enhancement of the conductivity is found for exoosure times lager than 60 min. - In no case a transition to a superconductiong state is pbwerved. Therefore recently reported superconductivity may be due to surface effects.
