Low Temperature Physics: 34, 262 (2008); https://doi.org/10.1063/1.2911650 (11 pages)
On a possible nature of the electric activity of He II
V.M. Loktev and M.D. Tomchenko
Bogolyubov Institute for Theoretical Physics of the National Academy of Sciences of Ukraine 14-b, Metrologicheskaya Str. Kiev, 03143, Ukraine
Received December 29, 2007
An attempt is made to explain the nature of the electric signals observed in a standing wave of the second sound in helium II. From the general quantum-mechanical principles we show that, due to interatomic interaction, each atom of He II acquires a small induced dipole moment dat, which pulses in time and space. A directed flow of microscopic vortex rings is formed in the standing halfwave of the second sound and partially orders the initially chaotically directed dipole moments of the atoms, leading to a volume polarization of He II. The observed electric induction DU≈kBDT/2e is explained theoretically basing on the assumption that each vortex ring has an individual dipole moment dvr of the order of ten atomic moments, dvr ~10d̅at. The analysis, which takes into account the boundary conditions, shows that the another possible nature of the observed induction DU, is not excluded: namely, this induction may be connected not with the properties of He II, but with the same kind of the thermoelectromuving force.
PACS: 67.40.Pm Transport processes, second and other sounds, and thermal counterflow; Kapitza resistance.
Key words: helium II, electrical activity, dipole moment, vortex rings.