Ultrasonic Attenuation in Vanadium at Low Temperatures

Longitudinal elastic wave attenuation measurements have been made in a vanadium single crystal in the frequency range of 45 to 435 Mc in both the normal and superconducting states, using pulse echo techniques. Novel experimental features include the use of a superconducting niobium electromagnet (supplied by Stanley H. Autler, Lincoln Laboratory, Massachusetts Institute of Technology). Throughout the frequency range the product ql >1. (Supported by Office of Naval Research.)