Cross-sectional views of the miniature high-pressure cell for the commercial SQUID magnetometer. The cell is 8.7 mm in diameter and 70 mm in length and is made up of two opposing ceramic anvils. The cell body, piston, locking nut, and gasket are made of non-magnetic and hardened Cu-Be alloy.
Temperature dependence of the magnetic susceptibility M/H of the composite ceramic (FCY20A) anvil measured in a magnetic field of 10 000 G.
Temperature dependence of the magnetization in magnetic field of 10 000 G for (a) the Ni-Cr-Al gasket in the indenter-type cell and (b) the Cu-Be gasket in the present miniature pressure cell.
(a) Responses of the scaled SQUID voltage produced during the standard DC scan of length 6 cm. Open squares represent the response for the pressure cell with CePd5Al2 at 4.5 K and 1.75 GPa and open triangles does that for the empty pressure cell without the sample at 4.5 K and 1 bar. The measurements were done in a magnetic field of 2000 G. (b) Open circles represent the difference in the response with and without the sample. The line is the fit to the response using Eq. (1).
Temperature dependences of the magnetization of Pb in magnetic field of 10 G using several anvils with the culet sizes ϕ1 = 1.8, 1.0, 0.8, and 0.6 mm.
Relations between the applied forces at room temperature and the pressure values at low temperatures for anvils with ϕ1 = 1.8, 1.6, 1.4, 1.2, 1.0, 0.8, and 0.6 mm.
Relations between maximum pressure and volume of the sample space for the present pressure cell (closed circles) and indenter cell (open square) from our study, piston-cylinder cell (open triangle) and DAC (open circle). The data for the present cell and indenter cell are from our study, and those for the piston cylinder and DAC are from Refs. 10 and 13, respectively.
Temperature dependences of the magnetization of MgB2 under magnetic field of 20 G at 1 bar, 3.9, 5.0, and 6.8 GPa. The data were obtained in the present pressure cell with the 0.6 mm culet anvils.
Temperature dependences of the magnetization of CePd5Al2 under magnetic field of 2000 G at (a) 1 bar with and without using the pressure cell and (b) 1 bar, 1.75, 2.96, and 3.30 GPa. The data were obtained by the present pressure cell using anvils with ϕ1 = 1.6 mm.
Miniature high-pressure cells for the commercial SQUID magnetometer. P max : maximum pressure and V sample : volume of sample space.
Experimental conditions. ϕ1: culet size of the ceramic anvils, ϕ2: diameter of the sample space, z: initial thickness of the gasket before loading and P max : maximum pressure.
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