| Issue |
EPL
Volume 83, Number 2, July 2008
|
|
|---|---|---|
| Article Number | 27008 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/83/27008 | |
| Published online | 05 July 2008 | |
Transport properties of an organic Mott insulator β'-(BEDT-TTF)2ICl2
1
RIKEN - Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan
2
Saitama University - Shimo-Ohkubo 225, Saitama, 338-8570, Japan
Corresponding author: taji@riken.jp
Received:
12
February
2008
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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