Correlation gap in the optical spectra of the two-dimensional organic metal (BEDT-TTF)4[Ni(dto)2]
P. Haas, E. Griesshaber, B. Gorshunov, D. Schweitzer, M. Dressel, F. F. Assaad
Abstract
Optical reflection measurements within the highly conducting (a,b)-plane of the organic metal (BEDT-TTF)4[Ni(dto)2] reveal the gradual development of a sharp feature at around 200 cm as the temperature is reduced below 150 K. Below this frequency a narrow Drude-like response is observed which accounts for the metallic behavior. Since de Haas-von Alphen oscillations at low temperatures confirm band structure calculations of bands crossing the Fermi energy, we assign the observed behavior to a two-dimensional metallic state in the proximity of a correlation induced metal-insulator transition.
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