Diamagnetic anomaly in pressure quenched CdS

Compacted powder samples of CdS, pressure quenched at approximately 1,000,000 bars/sec at room temperature from pressure above the semiconducting to conducting transition pressure (about 40 kilobars) exhibit an ac diamagnetic anomaly and an increase in electrical conductivity in the diamagnetic state at temperatures near 150 K. These samples, as well as samples pressure quenched from lower pressures but above 10 kbars reveal a layered structure consisting of amorphous platelets in a compact powder matrix. Other changes in the physical properties of these samples are reported.