Kosterlitz-Thouless-type transition in a charge ordered state of the layered organic conductor α-(BEDT-TTF)2I3

S. Uji, K. Kodama, K. Sugii, Y. Takahide, T. Terashima, N. Kurita, S. Tsuchiya, M. Kohno, M. Kimata, K. Yamamoto, K. Yakushi

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7 Citations (Scopus)

Abstract

The current-voltage characteristics in the charge order state of the two-dimensional organic conductor α-(BEDT-TTF)2I3 exhibit power law behavior at low temperatures. The power law is understood in terms of the electric-field-dependent potential between electrons and holes, which are thermally excited from the charge order state. The power law exponent steeply changes from 1 to 3 in the range from 30 to 45 K with decreasing temperature, thereby suggesting the occurrence of a Kosterlitz-Thouless-type transition; many (few) unbound electron-hole pairs are thermally excited above (below) the transition. The effects of the finite size and interlayer coupling on the power law behavior are discussed.

Original languageEnglish
Article number196602
JournalPhysical review letters
Volume110
Issue number19
DOIs
Publication statusPublished - 2013 May 8
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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