Structural studies of pressure-induced organic superconductor β″-(DODHT)2PF6 having charge-ordering phase at ambient pressure

Momoka Higa, Ryusuke Kondo, Seiichi Kagoshima, Hiroyuki Nishikawa

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We performed the crystal structure analyses of the pressure-induced organic superconductor β″-(DODHT)2PF6 (DODHT denotes (1,4-dioxane-2,3-diyldithio)dihydrotetrathiafulvalene) at the hydrostatic pressures of 0.75 GPa and 1.9 GPa in order to investigate the key parameter for inducing the superconductivity. At ambient pressure, β″-(DODHT) 2PF6 undergoes an insulator-to-insulator transition at 255 K accompanied by charge ordering. By applying pressure, this charge-ordering transition is suppressed and superconductivity is generated at around 3 K above 1.32 GPa. Using the obtained atomic coordinates, we estimated the transfer integrals t and intermolecular nearest-neighbor Coulomb interaction energies V between conduction electrons and found that one of V/|t| ratios perpendicular to charge-ordering stripes plays an important role in suppressing the charge-ordering phase.

Original languageEnglish
Article number034709
Journaljournal of the physical society of japan
Volume76
Issue number3
DOIs
Publication statusPublished - Mar 2007

Keywords

  • Charge ordering
  • Crystal structure analysis
  • Electronic property
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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