Determination of band-filling change in the two-dimensional organic conductor, τ-(EDO-S,S-DMEDT-TTF)2(AuBr2) 1+y, (y ≤ 0.875) by the quantum oscillation of magnetoresistance

Harukazu Yoshino; Keizo Murata; Tsutomu Nakanishi; Lin Li; Eun Sang Choi; David Graf; James S. Brooks; Yoshio Nogami; George C. Papavassiliou

doi:10.1143/JPSJ.74.417

Determination of band-filling change in the two-dimensional organic conductor, τ-(EDO-S,S-DMEDT-TTF)₂(AuBr₂) _1+y, (y ≤ 0.875) by the quantum oscillation of magnetoresistance

Harukazu Yoshino, Keizo Murata, Tsutomu Nakanishi, Lin Li, Eun Sang Choi, David Graf, James S. Brooks, Yoshio Nogami, George C. Papavassiliou

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

13 Citations (Scopus)

Abstract

The effect of thermal treatment on the transport properties is studied for a two-dimensional organic conductor τ-(EDO-S,S-DMEDT-TTF) ₂(AuBr₂)_1+y, (y ≤ 0.875). The temperature dependence of the electric resistivity below room temperature was found to be changed from metallic down to low temperature to semiconducting by heating up to 420 K. One of the two frequencies of Shubnikov-de Haas oscillations are found to be different between the non-heated and heated parts from a single crystal, while no evidence of structural change in X-ray photograph was observed. The present result clearly shows that nominal valence or band filling can be controlled by simple thermal treatment for the quasi-two-dimensional organic metal. The mechanism of the change in the band filling is discussed in terms of anion decomposition.

Original language	English
Pages (from-to)	417-424
Number of pages	8
Journal	journal of the physical society of japan
Volume	74
Issue number	1
DOIs	https://doi.org/10.1143/JPSJ.74.417
Publication status	Published - Jan 2005

Keywords

Band-filling control
Magnetoresistance
Organic conductor
Quantum oscillations
Quasi-two-dimensional system
Thermal treatment

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.74.417

Cite this

Yoshino, H., Murata, K., Nakanishi, T., Li, L., Choi, E. S., Graf, D., Brooks, J. S., Nogami, Y., & Papavassiliou, G. C. (2005). Determination of band-filling change in the two-dimensional organic conductor, τ-(EDO-S,S-DMEDT-TTF)₂(AuBr₂) _1+y, (y ≤ 0.875) by the quantum oscillation of magnetoresistance. journal of the physical society of japan, 74(1), 417-424. https://doi.org/10.1143/JPSJ.74.417

Determination of band-filling change in the two-dimensional organic conductor, τ-(EDO-S,S-DMEDT-TTF)₂(AuBr₂) _1+y, (y ≤ 0.875) by the quantum oscillation of magnetoresistance. / Yoshino, Harukazu; Murata, Keizo; Nakanishi, Tsutomu et al.

In: journal of the physical society of japan, Vol. 74, No. 1, 01.2005, p. 417-424.

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

Yoshino, H, Murata, K, Nakanishi, T, Li, L, Choi, ES, Graf, D, Brooks, JS, Nogami, Y & Papavassiliou, GC 2005, 'Determination of band-filling change in the two-dimensional organic conductor, τ-(EDO-S,S-DMEDT-TTF)₂(AuBr₂) _1+y, (y ≤ 0.875) by the quantum oscillation of magnetoresistance', journal of the physical society of japan, vol. 74, no. 1, pp. 417-424. https://doi.org/10.1143/JPSJ.74.417

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abstract = "The effect of thermal treatment on the transport properties is studied for a two-dimensional organic conductor τ-(EDO-S,S-DMEDT-TTF) 2(AuBr2)1+y, (y ≤ 0.875). The temperature dependence of the electric resistivity below room temperature was found to be changed from metallic down to low temperature to semiconducting by heating up to 420 K. One of the two frequencies of Shubnikov-de Haas oscillations are found to be different between the non-heated and heated parts from a single crystal, while no evidence of structural change in X-ray photograph was observed. The present result clearly shows that nominal valence or band filling can be controlled by simple thermal treatment for the quasi-two-dimensional organic metal. The mechanism of the change in the band filling is discussed in terms of anion decomposition.",

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AB - The effect of thermal treatment on the transport properties is studied for a two-dimensional organic conductor τ-(EDO-S,S-DMEDT-TTF) 2(AuBr2)1+y, (y ≤ 0.875). The temperature dependence of the electric resistivity below room temperature was found to be changed from metallic down to low temperature to semiconducting by heating up to 420 K. One of the two frequencies of Shubnikov-de Haas oscillations are found to be different between the non-heated and heated parts from a single crystal, while no evidence of structural change in X-ray photograph was observed. The present result clearly shows that nominal valence or band filling can be controlled by simple thermal treatment for the quasi-two-dimensional organic metal. The mechanism of the change in the band filling is discussed in terms of anion decomposition.

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