Abstract
A four-probe method is presented for the study of electrical-transport properties of materials ranging from insulators to metals. Development of several experimental procedures and apparatuses and the fabrication of a composite gasket has permitted quasihydrostatic electrical resistivity measurements of fragile single crystals. Using a fluid to transmit pressure to the sample, the integrity of the crystal is assured. Pressures to 7.5 GPa have been obtained using the diamond anvil cell.