Structural Studies of Pressure-Induced Organic Superconductor β"-(DODHT)_2PF_6 Having Charge-Ordering Phase at Ambient Pressure(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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We performed the crystal structure analyses of the pressure-induced organic superconductor β"-(DODHT)_2PF_6 (DODHT denotes (1,4-dioxane-2,3-diyldithio)dihydrotetrathiafulvalene) at the hydrostatic pressures of 0.75 GPa and 1.9GPa in order to investigate the key parameter for inducing the superconductivity. At ambient pressure, β"-(DODHT)_2PF_6 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.
社団法人日本物理学会の論文
2007-03-15