Thermal counterflow and electrical activity of superfluid systems in a magnetic field

The thermal counterflow in superfluid helium placed in a magnetic field is shown to lead to the emergence of an electric field in the surrounding space. This effect is caused by the counterflow nature of thermal conductivity in superfluid systems: heat transfer in such systems is associated with the...

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2020-01, Vol.46 (1), p.48-58
Main Authors: Shevchenko, S. I., Konstantinov, A. M.
Format: Article
Language:English
Subjects:
Counterflow
Electric fields
Electrical resistivity
Fluids
Heat transmission
Helium
Liquid helium
Magnetic fields
Mass flow
Superfluidity
Thermal conductivity
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Summary:The thermal counterflow in superfluid helium placed in a magnetic field is shown to lead to the emergence of an electric field in the surrounding space. This effect is caused by the counterflow nature of thermal conductivity in superfluid systems: heat transfer in such systems is associated with the motion of the normal component, while the average mass flow transported by the normal component is compensated by the mass flow carried by the superfluid component. The local mass flow is nonzero. The effect occurs in case of stationary and non-stationary (second-sound) heat flows. The features of the effect for a number of samples with various geometries are considered. It was established that the magnitude of the arising electric field substantially depends on the shape of the sample containing helium and the direction of the magnetic field.
ISSN:1063-777X
1090-6517
DOI:10.1063/10.0000363