Anisotropic resistivity and thermopower of the organic superconductor (ET)2Cu[ N(CN)2] Br

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Abstract
We have measured the temperature dependence of the resistivity of (ET)2Cu [ N(CN)2] Br in three crystallographic directions and the thermopower in the a and c directions. the resistivity has two maxima - at 75 and 95 K. The value of the resistivity anisotropy is rather large: ρb/ρa is about 103 at the ambient temperature and increases with lowering temperature below 50 K. The temperature derivative of resistivity exhibits a strong maximum at 50 K. Thermopower is positive for the a direction, while it is negative for the c direction. We have concluded, that (ET)2Cu[ N(CN)2] Br undergoes insulator-metal transition near 50 K similarly to (ET)2Cu(NCS)2

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