The electric conductivity which reveals the zero gap semiconducting (ZGS) state has been investigated as the function of temperature T and life time τ in order to understand the ZGS state in quarter-filled α-(BEDT-TTF)₂I₃ salt with four sites in the unit cell. By treating τ as a parameter and making use of the one-loop approximation, it is found that the conductivity is proportional to T and τ for kB/τ and independent of T and τ for kB T/τ. Further the conductivity being independent of T in the ZGS state is examined in terms of Born approximation for the impurity cattering.
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Katayama et al. (2006) studied this question.
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