Current-density dependence of the charge-ordering gap in the organic salt θ-(BEDT-TTF) 2CsM(SCN) 4 (M = Zn, Co, and Co 0.7Zn 0.3)

Fumiaki Sawano, Tomohiro Suko, Taichi S. Inada, Shuichi Tasaki, Ichiro Terasaki, Hatsumi Mori, Takehiko Mori, Yoshio Nogami, Naoshi Ikeda, Masashi Watanabe, Yukio Noda

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We have measured and analyzed the resistivity and voltage-current characteristics of the charge-ordered organic salt θ-(BEDT-TTF) 2CsM(SCN) 4 (M = Zn, Co, and Co 0.7Zn 0.3). At 4.3 K, all the samples show giant nonlinear conduction, in which the c-axis resistivity markedly decreases with external current by a factor of 10 against a small electric field of 1 V/cm. The temperature dependence of the resistivity is well described by an activation law, the activation energy of which is evaluated to be 2 meV in the lowcurrent limit, and linearly decreases with external current. The activation energy and x-ray intensity near q 2 = (0, k, 1/2) are found to show the same dependence on current density. This coincidence strongly suggests that the energy gap of the charge order indexed by q 2 is an order parameter of this phenomenon.

Original languageEnglish
Article number024714
JournalJournal of the Physical Society of Japan
Volume78
Issue number2
DOIs
Publication statusPublished - Feb 2009

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current density
salts
electrical resistivity
activation energy
activation
conduction
temperature dependence
electric fields
electric potential
x rays

Keywords

  • BEDT-TTF
  • Charge ordering
  • Nonlinear conduction x-ray diffraction
  • Organic conductor

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Current-density dependence of the charge-ordering gap in the organic salt θ-(BEDT-TTF) 2CsM(SCN) 4 (M = Zn, Co, and Co 0.7Zn 0.3). / Sawano, Fumiaki; Suko, Tomohiro; Inada, Taichi S.; Tasaki, Shuichi; Terasaki, Ichiro; Mori, Hatsumi; Mori, Takehiko; Nogami, Yoshio; Ikeda, Naoshi; Watanabe, Masashi; Noda, Yukio.

In: Journal of the Physical Society of Japan, Vol. 78, No. 2, 024714, 02.2009.

Research output: Contribution to journalArticle

Sawano, Fumiaki ; Suko, Tomohiro ; Inada, Taichi S. ; Tasaki, Shuichi ; Terasaki, Ichiro ; Mori, Hatsumi ; Mori, Takehiko ; Nogami, Yoshio ; Ikeda, Naoshi ; Watanabe, Masashi ; Noda, Yukio. / Current-density dependence of the charge-ordering gap in the organic salt θ-(BEDT-TTF) 2CsM(SCN) 4 (M = Zn, Co, and Co 0.7Zn 0.3). In: Journal of the Physical Society of Japan. 2009 ; Vol. 78, No. 2.
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abstract = "We have measured and analyzed the resistivity and voltage-current characteristics of the charge-ordered organic salt θ-(BEDT-TTF) 2CsM(SCN) 4 (M = Zn, Co, and Co 0.7Zn 0.3). At 4.3 K, all the samples show giant nonlinear conduction, in which the c-axis resistivity markedly decreases with external current by a factor of 10 against a small electric field of 1 V/cm. The temperature dependence of the resistivity is well described by an activation law, the activation energy of which is evaluated to be 2 meV in the lowcurrent limit, and linearly decreases with external current. The activation energy and x-ray intensity near q 2 = (0, k, 1/2) are found to show the same dependence on current density. This coincidence strongly suggests that the energy gap of the charge order indexed by q 2 is an order parameter of this phenomenon.",
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AU - Sawano, Fumiaki

AU - Suko, Tomohiro

AU - Inada, Taichi S.

AU - Tasaki, Shuichi

AU - Terasaki, Ichiro

AU - Mori, Hatsumi

AU - Mori, Takehiko

AU - Nogami, Yoshio

AU - Ikeda, Naoshi

AU - Watanabe, Masashi

AU - Noda, Yukio

PY - 2009/2

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N2 - We have measured and analyzed the resistivity and voltage-current characteristics of the charge-ordered organic salt θ-(BEDT-TTF) 2CsM(SCN) 4 (M = Zn, Co, and Co 0.7Zn 0.3). At 4.3 K, all the samples show giant nonlinear conduction, in which the c-axis resistivity markedly decreases with external current by a factor of 10 against a small electric field of 1 V/cm. The temperature dependence of the resistivity is well described by an activation law, the activation energy of which is evaluated to be 2 meV in the lowcurrent limit, and linearly decreases with external current. The activation energy and x-ray intensity near q 2 = (0, k, 1/2) are found to show the same dependence on current density. This coincidence strongly suggests that the energy gap of the charge order indexed by q 2 is an order parameter of this phenomenon.

AB - We have measured and analyzed the resistivity and voltage-current characteristics of the charge-ordered organic salt θ-(BEDT-TTF) 2CsM(SCN) 4 (M = Zn, Co, and Co 0.7Zn 0.3). At 4.3 K, all the samples show giant nonlinear conduction, in which the c-axis resistivity markedly decreases with external current by a factor of 10 against a small electric field of 1 V/cm. The temperature dependence of the resistivity is well described by an activation law, the activation energy of which is evaluated to be 2 meV in the lowcurrent limit, and linearly decreases with external current. The activation energy and x-ray intensity near q 2 = (0, k, 1/2) are found to show the same dependence on current density. This coincidence strongly suggests that the energy gap of the charge order indexed by q 2 is an order parameter of this phenomenon.

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