Anomalous roton-induced drag on negative ions in He II.

Allum, D. R. and McClintock, Peter V. E. and Phillips, A. (1975) Anomalous roton-induced drag on negative ions in He II. Physics Letters A, 54 (5). pp. 385-386. ISSN 0375-9601

Abstract

Measurements have been made of the drift velocities v of negative ions moving through pressurized He II as a function of electric field E. In the roton-dominated temperature range the effective mobility mu = v/E is found to increase with increasing E.