Superconductivity up to 147 K in HgBa2CaCu2O6+δunder quasi-hydrostatic pressure

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Abstract
The superconducting transition temperature of the n = 2 member of the homologous series HgBa2Can-1CunO2n + 2 + δ with two CuO2 layers per unit cell has been measured under quasi-hydrostatic pressures up to about 18·5 GPa. Superconductivity up to 147 K has been detected with a main transition at 138K at 18·5 GPa without saturation. This represents the highest superconducting transition temperature ever reported in a cuprate compound with two CuO2 layers. It is expected that superconductivity at temperatures higher than 147 K can be achieved in this compound either under higher pressures or by chemical substitution at ambient pressure.