Instability of charge ordered states probed in mesoscopic θ -(BEDT-TTF) 2RbZn(SCN) 4 crystals

Kaya Kobayashi, Naoki Uchida

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We developed a technique to grow organic crystals in nanoliter cells compatible with subsequent electrical transport measurements. The crystals grown in this technique have thickness less than 1 μm due to the confined growth condition. Here, a q2D organic conductor that shows a metal-insulator transition in low temperature is grown. Resistivity (ρ{variant}) measurements as a function of temperature (T) showed no discontinuity in dρ{variant} /dT in contrast to the reported behavior in bulk crystals. Instead, ρ{variant} displays a broad increase in the vicinity of 150 K. The nonlinear behavior of IV curves observed obeys a power law for most of the T range. A high bias voltage did not change the broad increase of resistivity between 140 and 160 K. The color plot demonstrates that the CO state is stable against biasing by an electric field.

Original languageEnglish
Pages (from-to)1167-1170
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume9
Issue number5
DOIs
Publication statusPublished - May 2012
Externally publishedYes

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crystals
electrical resistivity
discontinuity
conductors
plots
insulators
color
electric fields
electric potential
curves
cells
metals
temperature

Keywords

  • Electric field
  • Nanocrystal
  • Organic conductors
  • Stress effect
  • Transport measurement

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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AB - We developed a technique to grow organic crystals in nanoliter cells compatible with subsequent electrical transport measurements. The crystals grown in this technique have thickness less than 1 μm due to the confined growth condition. Here, a q2D organic conductor that shows a metal-insulator transition in low temperature is grown. Resistivity (ρ{variant}) measurements as a function of temperature (T) showed no discontinuity in dρ{variant} /dT in contrast to the reported behavior in bulk crystals. Instead, ρ{variant} displays a broad increase in the vicinity of 150 K. The nonlinear behavior of IV curves observed obeys a power law for most of the T range. A high bias voltage did not change the broad increase of resistivity between 140 and 160 K. The color plot demonstrates that the CO state is stable against biasing by an electric field.

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