Measurement of the Landau velocity in He II.

Ellis, T. and Jewell, C. I. and McClintock, Peter V. E. (1980) Measurement of the Landau velocity in He II. Physics Letters A, 78 (4). pp. 358-360. ISSN 0375-9601

Abstract

We report the preliminary results of an experiment to measure the Landau critical velocity in He II. Our measurements, for pressures P in the range 19 < P < 25 bar, agree to better than 1% with values of vL calculated from accepted values of the Landau parameters, but lie systematically above them.