ULTRASONIC ATTENUATION IN ZINC SINGLE CRYSTALS AT LOW TEMPERATURES

The ultrasonic attenuation in zinc single crystals were studied in the temperature range from 4.2°K to 300°K. In pure zinc specimen, three peaks were observed in the attenuation, temperature curves. The peaks were named P1, P2and P3in the order from lower to higher temperature. P1, P2and P3were observed in the attenuation of the longitudinal wave along the direction 43.25° to c-axis and the shear wave parallel to the basal plane. On the other hand, only P3 was observed in the attenuation of the longitudinal waves travelling perpendicular to the basal plane. The relaxation processes appearing in the form of P1, P2and P33 peaks were interpreted to be associated with the dislocation movement in the basal plane, prismatic plane and pyramidal plane, respectively. A theory of relaxation process in terms of formation of a pair of kinks is proposed. © 1969, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.