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Periodic Critical Velocities of Ions in Liquid Helium II. Temperature Dependence

L. Bruschi, P. Mazzoldi, and M. Santini

  • Istituto di Fisica, Università di Padova, Padova, Italia and Gruppo Nazionale Struttura della Materia, del Consiglio Nazionale delle Ricerche, Roma, Italia

Phys. Rev. 167, 203 – Published 5 March, 1968

DOI: https://doi.org/10.1103/PhysRev.167.203

Abstract

The behavior of positive- and negative-ion mobility in liquid helium as a function of the electric-field intensity has been investigated from 1.0 up to 2.3°K. Periodic discontinuities have been observed up to the λ point, while within the limits of the present technique no discontinuity has been observed above Tλ. It has been confirmed that the velocity at which the discontinuity occurs is temperature-independent below 1.1°K, but above this point a striking temperature dependence is reported. Various theoretical models proposed to account for this phenomenon around 1°K are discussed, and are found to be unsatisfactory at higher temperatures.

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