Investigation of X-ray diffuse scattering in θ-(BEDT-TTF) 2RbM'(SCN)4

M. Watanabe; Y. Noda; Y. Nogami; H. Mori

doi:10.1016/S0379-6779(02)00769-5

Investigation of X-ray diffuse scattering in θ-(BEDT-TTF) ₂RbM'(SCN)₄

M. Watanabe, Y. Noda, Y. Nogami, H. Mori

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

34 Citations (Scopus)

Abstract

The modulated structure of θ-(BEDT-TTF)₂RbM'(SCN) ₄; (M'=Zn, Co) were investigated by X-ray diffraction method. θ-(BEDT-TTF)₂RbM'(SCN)₄ are two-dimensional organic conductors which exhibit metal-insulator transition at 210 K. The insulating phase is known as a charge ordered state. Above T_MI= 210 K, diffuse rod of q=(1/3 k 1/4) was found. Below T_MI, there are some differences depending on the sample cooling speed. In the slow-cooled-state (0.2 K/min), the diffuse rod of q=(1/3 k 1/4) disappears and is replaced by superlattice of c*/2. In the rapid-cooled-state (5-6 K/min), the structural phase transition at T_I becomes imperfect. The diffuse rod of q remains below TMI and the lattice modulation of c*/2 is disordered in the direction of inter-conducting-layer.

Original language	English
Pages (from-to)	665-666
Number of pages	2
Journal	Synthetic Metals
Volume	135-136
DOIs	https://doi.org/10.1016/S0379-6779(02)00769-5
Publication status	Published - Apr 4 2003

Keywords

Metal-insulator phase transition
Organic conductors based on radical cation and/or anion.
Structural phase transition
X-ray emission diffraction and scattering

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/S0379-6779(02)00769-5

Cite this

@article{3184ac8833f640da9d345f1882fdefbe,

title = "Investigation of X-ray diffuse scattering in θ-(BEDT-TTF) 2RbM'(SCN)4",

abstract = "The modulated structure of θ-(BEDT-TTF)2RbM'(SCN) 4; (M'=Zn, Co) were investigated by X-ray diffraction method. θ-(BEDT-TTF)2RbM'(SCN)4 are two-dimensional organic conductors which exhibit metal-insulator transition at 210 K. The insulating phase is known as a charge ordered state. Above TMI= 210 K, diffuse rod of q=(1/3 k 1/4) was found. Below TMI, there are some differences depending on the sample cooling speed. In the slow-cooled-state (0.2 K/min), the diffuse rod of q=(1/3 k 1/4) disappears and is replaced by superlattice of c*/2. In the rapid-cooled-state (5-6 K/min), the structural phase transition at TI becomes imperfect. The diffuse rod of q remains below TMI and the lattice modulation of c*/2 is disordered in the direction of inter-conducting-layer.",

keywords = "Metal-insulator phase transition, Organic conductors based on radical cation and/or anion., Structural phase transition, X-ray emission diffraction and scattering",

author = "M. Watanabe and Y. Noda and Y. Nogami and H. Mori",

year = "2003",

month = apr,

day = "4",

doi = "10.1016/S0379-6779(02)00769-5",

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journal = "Synthetic Metals",

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T1 - Investigation of X-ray diffuse scattering in θ-(BEDT-TTF) 2RbM'(SCN)4

AU - Watanabe, M.

AU - Noda, Y.

AU - Nogami, Y.

AU - Mori, H.

PY - 2003/4/4

Y1 - 2003/4/4

N2 - The modulated structure of θ-(BEDT-TTF)2RbM'(SCN) 4; (M'=Zn, Co) were investigated by X-ray diffraction method. θ-(BEDT-TTF)2RbM'(SCN)4 are two-dimensional organic conductors which exhibit metal-insulator transition at 210 K. The insulating phase is known as a charge ordered state. Above TMI= 210 K, diffuse rod of q=(1/3 k 1/4) was found. Below TMI, there are some differences depending on the sample cooling speed. In the slow-cooled-state (0.2 K/min), the diffuse rod of q=(1/3 k 1/4) disappears and is replaced by superlattice of c*/2. In the rapid-cooled-state (5-6 K/min), the structural phase transition at TI becomes imperfect. The diffuse rod of q remains below TMI and the lattice modulation of c*/2 is disordered in the direction of inter-conducting-layer.

AB - The modulated structure of θ-(BEDT-TTF)2RbM'(SCN) 4; (M'=Zn, Co) were investigated by X-ray diffraction method. θ-(BEDT-TTF)2RbM'(SCN)4 are two-dimensional organic conductors which exhibit metal-insulator transition at 210 K. The insulating phase is known as a charge ordered state. Above TMI= 210 K, diffuse rod of q=(1/3 k 1/4) was found. Below TMI, there are some differences depending on the sample cooling speed. In the slow-cooled-state (0.2 K/min), the diffuse rod of q=(1/3 k 1/4) disappears and is replaced by superlattice of c*/2. In the rapid-cooled-state (5-6 K/min), the structural phase transition at TI becomes imperfect. The diffuse rod of q remains below TMI and the lattice modulation of c*/2 is disordered in the direction of inter-conducting-layer.

KW - Metal-insulator phase transition

KW - Organic conductors based on radical cation and/or anion.

KW - Structural phase transition

KW - X-ray emission diffraction and scattering

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