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

29 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 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.

Original languageEnglish
Pages (from-to)665-666
Number of pages2
JournalSynthetic Metals
Volume135-136
DOIs
Publication statusPublished - 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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