Abstract
The P – T phase diagram and transport properties of a layered organic superconductor, κ-(BEDT-TTF) 4 Hg 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 4.5 GPa, we uncovered anomalous pressure dependence of T c of this superconductor, including a peak structure at approximatly 0.7 GPa 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 ≈2 GPa, at which T c has a turning value, corresponds to the onset of the T -squared behavior.
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