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Non-linear current–voltage characteristics in α-(BEDT-TTF)2I3

✍ Scribed by K. Kodama; M. Kimata; Y. Takahide; T. Terashima; H. Satsukawa; A. Harada; K. Hazama; S. Uji; K. Yamamoto; K. Yakushi

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
576 KB
Volume
405
Category
Article
ISSN
0921-4526

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✦ Synopsis

Current-voltage (I-V) characteristics have been measured to clarify the charge transport mechanism in the charge order state of a two dimensional organic conductor a-(BEDT-TTF) 2 I 3 . At low temperatures, we find strong non-linear I-V characteristics that follow the power law approximately. The non-linear I-V characteristics are attributed to the electric-filed-assisted unbinding of excited pairs of an electron and a hole that attract each other due to two-dimensional long-range Coulomb interaction. We also report a larger anisotropy in the dielectric constant, which shows the highly two-dimensional nature of the Coulomb interaction in the BEDT-TTF layers.

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✍ T. Mishima; K. Kajita; Y. Nishio; Y. Iye 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 403 KB

The temperature and magnetic field dependence of the electrical conductivity of a-(BEDT-TTF)2I 3 under high pressure was investigated between 20 K and 2 K. The results were analyzed using the Boltzmarm equation method. It is shown that the mobility of carriers increases with decreasing temperature,