Fizika Nizkikh Temperatur: Volume 48, Number 2 (February 2022), p. 143-153 ( to contents , go back )
Analysis of experiments on the study of electrical activity in helium
V. A. Maidanov, V. E. Syvokon, and S. S. Sokolov
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine
Received July 7, 2021, published online December 24, 2021
From the experimental point of view, the works on the study of the so-called electrical activity in superfluid helium are analyzed. Based on the analysis of published data on the results of experiments on the appearance of such electrical activity under the propagation of second sound waves, during oscillations of a torsion oscillator filled with helium and microwave electromagnetic pumping of helium, one concludes that the experimental results published before 2016 do not give sufficient reasons to assume the presence of any special electrical activity of helium, and the appearance of an electric signal in a cell with superfluid helium at the propagation of acoustic waves in it can only be said after 2016. The nature of this signal needs further investigation.
Key words: superfluid helium, second sound, electrical activity, torsion oscillator, microwave electromagnetic pumping.