Fig. 1. (a) Schematic of high-pressure experimental setup for resistance measurements in a diamond anvil cell, where a mixture of cubic boron nitride (c-BN) and epoxy serves as an insulating material, and ruby is utilized as a pressure calibrator for determining the sample pressure. (b) Enlarged view illustrating the arrangement of the sample in the gasket hole. A standard four-probe method is used to establish contact with the sample, while the insulating material is employed to isolate it from the metallic gasket. (c) Sample for measurement and the technique for resistance measurement. The three equations provide an explanation of the method for determining the resistivity of compressed materials.