Traditionally,a diamond anvil cell(DAC) operated at low temperature can be pressurized by using a helium-driven piston or remote control tightening mechanism.This approach of pressurizing DAC is not convenient for operating at low temperature.Here we develop a low-temperature pressurizing technique for in situ tuning pressure in DAC at 20 K by an electrically driven method.The improved DAC pressure apparatus is composed of traditional DAC device and a piezoelectric actuator(PZT).Here the PZT used in the exp...