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

31 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

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@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",

language = "English",

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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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