Electrical conduction in divalent BEDT-TTF salts

H. Ito; Y. Yokochi; H. Tanaka; S. Kuroda; R. Kanehama; M. Umemiya; H. Miyasaka; K. I. Sugiura; M. Yamashita

doi:10.1016/j.synthmet.2005.07.326

Electrical conduction in divalent BEDT-TTF salts

H. Ito, Y. Yokochi, H. Tanaka, S. Kuroda, R. Kanehama, M. Umemiya, H. Miyasaka, K. I. Sugiura, M. Yamashita

IMR - Materials Development Division

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Transport and ESR measurements have been performed on organic semiconductors synthesized by the diffusion method. For (BEDT-TTF)Cu ₂Br₄, a pressure of 1 GPa raises the conductivity by up to one order of magnitude, but does not alter the semiconducting nature. By the ESR measurements, we find no Cu²⁺ signals, indicating that the BEDT-TTF molecules are divalent. The Hall carrier concentration increases exponentially with temperature, approaching the spin concentration evaluated by the low-temperature ESR from π-electrons. Thermopower measurements also support the contribution of the thermally activated electronic carriers. For (BEDTTTF)₂Cu₃Br₇(H₂O), the conductivity increases twice by applying a pressure of 0.8 GPa.

Original language	English
Pages (from-to)	441-444
Number of pages	4
Journal	Synthetic Metals
Volume	153
Issue number	1-3
DOIs	https://doi.org/10.1016/j.synthmet.2005.07.326
Publication status	Published - 2005 Sept 21

Keywords

Conductivity
Electron spin resonance
Hall effect
Organic conductors
Thermopower

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10.1016/j.synthmet.2005.07.326

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title = "Electrical conduction in divalent BEDT-TTF salts",

abstract = "Transport and ESR measurements have been performed on organic semiconductors synthesized by the diffusion method. For (BEDT-TTF)Cu 2Br4, a pressure of 1 GPa raises the conductivity by up to one order of magnitude, but does not alter the semiconducting nature. By the ESR measurements, we find no Cu2+ signals, indicating that the BEDT-TTF molecules are divalent. The Hall carrier concentration increases exponentially with temperature, approaching the spin concentration evaluated by the low-temperature ESR from π-electrons. Thermopower measurements also support the contribution of the thermally activated electronic carriers. For (BEDTTTF)2Cu3Br7(H2O), the conductivity increases twice by applying a pressure of 0.8 GPa.",

keywords = "Conductivity, Electron spin resonance, Hall effect, Organic conductors, Thermopower",

author = "H. Ito and Y. Yokochi and H. Tanaka and S. Kuroda and R. Kanehama and M. Umemiya and H. Miyasaka and Sugiura, {K. I.} and M. Yamashita",

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T1 - Electrical conduction in divalent BEDT-TTF salts

AU - Ito, H.

AU - Yokochi, Y.

AU - Tanaka, H.

AU - Kuroda, S.

AU - Kanehama, R.

AU - Umemiya, M.

AU - Miyasaka, H.

AU - Sugiura, K. I.

AU - Yamashita, M.

PY - 2005/9/21

Y1 - 2005/9/21

N2 - Transport and ESR measurements have been performed on organic semiconductors synthesized by the diffusion method. For (BEDT-TTF)Cu 2Br4, a pressure of 1 GPa raises the conductivity by up to one order of magnitude, but does not alter the semiconducting nature. By the ESR measurements, we find no Cu2+ signals, indicating that the BEDT-TTF molecules are divalent. The Hall carrier concentration increases exponentially with temperature, approaching the spin concentration evaluated by the low-temperature ESR from π-electrons. Thermopower measurements also support the contribution of the thermally activated electronic carriers. For (BEDTTTF)2Cu3Br7(H2O), the conductivity increases twice by applying a pressure of 0.8 GPa.

AB - Transport and ESR measurements have been performed on organic semiconductors synthesized by the diffusion method. For (BEDT-TTF)Cu 2Br4, a pressure of 1 GPa raises the conductivity by up to one order of magnitude, but does not alter the semiconducting nature. By the ESR measurements, we find no Cu2+ signals, indicating that the BEDT-TTF molecules are divalent. The Hall carrier concentration increases exponentially with temperature, approaching the spin concentration evaluated by the low-temperature ESR from π-electrons. Thermopower measurements also support the contribution of the thermally activated electronic carriers. For (BEDTTTF)2Cu3Br7(H2O), the conductivity increases twice by applying a pressure of 0.8 GPa.

KW - Conductivity

KW - Electron spin resonance

KW - Hall effect

KW - Organic conductors

KW - Thermopower

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Electrical conduction in divalent BEDT-TTF salts

Abstract

Keywords

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