Anomalous Pressure Dependence of Superconductivity in Layered Organic Conductor, κ-(BEDT-TTF)_4Hg_<2.89>Br_8(Condensed matter : electronic structure and electrical, magnetic, and optical properties)

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The P-T phase diagram and transport properties of a layered organic superconductor, κ-(BEDT-TTF)_4Hg_<2.89>Br_8, which can be viewed as a nealy half-filled band system, are reported. Through careful resistivity measurements under pressures of up to 4.5GPa, we uncovered anomalous pressure dependence of T_c of this superconductor, including a peak structure at approximatly 0.7GPa and a minimum structure at higher pressure. The normal-state resistivity showed T-linear behavior at low pressures and this behavior gradually transformed into T-squared behavior with increasing pressure. The pressure, P_c≈2GPa, at which T_c has a turning value, corresponds to the onset of the T-squared behavior.
社団法人日本物理学会の論文
2007-11-15