Transport properties of an organic Mott insulator beta '-(BEDT-TTF)(2)ICl2
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We have investigated the temperature dependence of the Hall coefficient and the resistivity of an organic Mott insulator, beta '-(BEDT-TTF)(2)ICl2 under ambient and hydrostatic pressures up to 2GPa. The charge gap, Delta, the effective mass, m*, and the scattering lifetime of carriers on Mott Hubbard bands were evaluated by analyzing these transport properties. We found that m* and Delta are written approximately as 1/m* infinity (1 - Delta/U-eff) in the low-pressure region and obtained the value of the effective on-site Coulomb energy, U-eff, of similar to 445meV. Moreover, we reveal that the effective scattering lifetime is proportional to the average distance between carriers in the two-dimensional plane, which suggests the existence of a scattering process attributable to carrier-carrier umklapp scattering in the Mott insulating state. Copyright (C) EPLA, 2008.
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