A NiCrAl pressure cell up to 4.6 GPa and its application to cuprate and pnictide superconductors

A pressurizing trial was performed for a hybrid NiCrAl hybrid pressure cell and a pressure of 4.6 GPa was achieved under a steady load of 15.0 ton, which marks the highest pressure ever known for a piston-cylinder-type pressure cell. The pressure efficiency at 15.0 ton was 75% and the expansion of the inner diameter of the NiCrAl cylinder partially reached 5%. The pressure cell was applied to nuclear-magnetic-resonance experiments on cuprate and pnictide superconductors.