Charge transport in charge-ordered states of two-dimensional organic conductors, α-(BEDT-TTF) 2I 3 and α'-(BEDT-TTF) 2IBr 2

Kota Kodama, Motoi Kimata, Yamaguchi Takahide, Nobuyuki Kurita, Atsushi Harada, Hidetaka Satsukawa, Taichi Terashima, Shinya Uji, Kaoru Yamamoto, Kyuya Yakushi

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Electric conductance and dielectric constant have been measured in the charge-ordered states of the quasi two-dimensional organic conductors α-(BEDT-TTF) 2I 3 and α'-(BEDT-TTF) 2IBr 2 to understand the charge transport mechanism. The current-voltage (I-V) characteristics show a strong nonlinear behavior, which is qualitatively explained by the transport of individual carriers thermally excited from the charge-ordered states in BEDT-TTF layers. The discrepancy with the simulation based on the thermal activation model at low temperatures is likely due to quantum tunneling through the potential barrier. The dielectric constants show a large difference between the in-plane and out-of-plane directions of the samples, showing a highly two-dimensional nature of Coulomb potential. The temperature dependence of dielectric constant is ascribed to the polarization effect of the thermally excited electronhole pairs, consistent with the model of nonlinear I-V characteristics. All these features are qualitatively the same between α-(BEDT-TTF) 2I 3 and α'-(BEDT-TTF) 2IBr 2, despite the different structural and magnetic properties.

Original languageEnglish
Article number044703
Journaljournal of the physical society of japan
Issue number4
Publication statusPublished - 2012 Apr
Externally publishedYes


  • Charge ordering
  • Dielectric property
  • Low-dimensional system
  • Nonlinear I-V characteristics
  • Organic conductor
  • Strongly correlated electron system

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Charge transport in charge-ordered states of two-dimensional organic conductors, α-(BEDT-TTF) <sub>2</sub>I <sub>3</sub> and α'-(BEDT-TTF) <sub>2</sub>IBr <sub>2</sub>'. Together they form a unique fingerprint.

Cite this