Development of miniature diamond anvil cell for the superconducting quantum interference device magnetometer

We have developed a novel miniature diamond anvil cell (mDAC) with a diamet er of 8.5 min and a length of 35 mm for a commercial superconducting quantu m interference device (SQUID) magnetometer. In this mDAC, both X-Y and tilt adjustments of diamond anvil are possible. The SQUID magnetometer with thi s mDAC works under pressures higher than I GPa in a wide range of temperatu re and high magnetic field region. As for the test operation of this system , we first investigated the standard pressure effects of metallic supercond uctor Pb up to the pressure P = 3.8 GPa at the magnetic field H = 100 G and after that we investigated the pressure effect of an f-electron ferromagne tic compound GdZn2 UP to P = 4.9 GPa for H less than or equal to 20000 G. T he sensitivity of the present system is about 10(-6) emu.