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The pressure effect on the superconducting transition temperature of black phosphorus

We have measured the pressure effect on the superconducting transition temperature Tc of black phosphorus up to 160 GPa using a superconducting quantum interference device vibrating coil magnetometer. It was found that Tc had a maximum value of about 9.5 K at about 32 GPa, began decreasing with pressure and reached about 4.3 K at about 100 GPa.