Volume 83, Number 2, July 2008
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||05 July 2008|
Transport properties of an organic Mott insulator β'-(BEDT-TTF)2ICl2
RIKEN - Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan
2 Saitama University - Shimo-Ohkubo 225, Saitama, 338-8570, Japan
Corresponding author: email@example.com
Accepted: 4 June 2008
We have investigated the temperature dependence of the Hall coefficient and the resistivity of an organic Mott insulator, -(BEDT-TTF)2ICl2 under ambient and hydrostatic pressures up to 2 GPa. The charge gap, , 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 are written approximately as in the low-pressure region and obtained the value of the effective on-site Coulomb energy, Ueff, of ~ 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.
PACS: 75.47.-m – Magnetotransport phenomena; materials for magnetotransport / 72.15.Gd – Galvanomagnetic and other magnetotransport effects / 71.20.Rv – Polymers and organic compounds
© EPLA, 2008
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