Ultrahigh-pressure effects in metallo-organics

Seiichi Kagoshima, Ryusuke Kondo, Nobuyuki Matsushita, Momoka Higa, Sergey V. Ovsyannikov, Nadezhda A. Shaydarova, Vladimir V. Shchennikov, Andrey Y. Manakov, Anna Y. Likhacheva

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The results are reported of the pressure (P) dependence of the electrical resistance (R), the thermoelectric power (Seebeck effect) (S), and compressibility as well as the time dependence of R at fixed P up to 20 GPa for four metallo-organics based on the BEDT-TTF (bisethylenedithiolo- tetrathiorulvalene) group, θ-(BEDT-TTF)2CsZn(SCN)4, α-(BEDT-TTF)2I3, β′-(BEDT-TTF) 2PF6, and (BEDT-TTF)-TCNQ. X-ray powder and single-crystal diffraction studies were also made on θ-(BEDT-TTF)2CsZn(SCN) 4 at high pressures up to P ∼ 10 GPa. The R values of all the crystals decreased with pressure up to P ∼ 3-5 GPa (low-pressure regime), and then the sign of dR/dP inverted (high-pressure regime). From the investigation of the mechanical and structural properties, these materials were found to have a large compressibility in the low-pressure regime, and a small one in the high-pressure region. In θ-(BEDT-TTF)2CsZn(SCN) 4 we observed pressure- induced reversible degradation (amorphization) in structure without a solid-phase reaction.

Original languageEnglish
Pages (from-to)418-423
Number of pages6
JournalPhysica Status Solidi (B) Basic Research
Volume244
Issue number1
DOIs
Publication statusPublished - Jan 1 2007
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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