Hall measurements to 40 kilobars under hydrostatic pressure in a piston-cylinder device

A technique for Hall measurements under truly hydrostatic pressures to 40 kilobars is described. The method employs the piston-cylinder apparatus with a Teflon cell to contain a suitable fluid. The necessary magnetic field is generated by a coil placed inside the cell. Hall data can be obtained over the full pressure range, at temperatures from 150 to 300 K. Results for an Al(x)Ga(1-x)As sample are presented as an example.