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SUMMARY:Convective thermomagnetic effect in normal and superfluid systems
DTSTART;VALUE=DATE-TIME:20221221T132000Z
DTEND;VALUE=DATE-TIME:20221221T134000Z
DTSTAMP;VALUE=DATE-TIME:20260818T123609Z
UID:indico-contribution-246@indico.bitp.kiev.ua
DESCRIPTION:Speakers: Oleksandr Konstantynov (B.Verkin Institute for Low T
 emperature Physics and Engineering  of the National Academy of Sciences of
  Ukraine)\nIt is known that the motion of a medium results in an interacti
 on between the electric and magnetic fields [1]. In particular\, the motio
 n of a dielectric in an external magnetic field $\\textbf{H}$ will lead to
  its polarization. It is generally assumed that the speed of motion is det
 ermined by the mechanical motion of the system. There are\, however\, situ
 ations where this motion is associated with a temperature gradient $\\nabl
 a T$.\nOne of them is related to counterflow thermal conductivity (often r
 eferred to as superthermal conductivity) in superfluid systems\, due to wh
 ich even small temperature gradients ($\\nabla T\\approx10^{-3}K$) lead to
  significant fluxes of the superfluid and normal components in the absence
  of an average mass flux. As shown in [2\, 3]\, in the presence of an exte
 rnal magnetic field\, these flows lead to a polarization of the liquid and
  the appearance of electric fields in the surrounding space\, which can be
  observed by modern experimental methods.\nAnother situation is the develo
 pment of thermogravitational convective instability in normal systems\, wh
 ich consists in the mechanical disequilibrium of a hydrodynamic system und
 er the action of a temperature gradient. As a result\, in the presence of 
 a magnetic field the system also acquires polarization\, which\, in turn\,
  can lead to the appearance of an electric field in the surrounding space.
  The measurement of this field can be used as a basis for creating a sensi
 tive device for determining temperature gradients.\n\n[1] L.D. Landau\, E.
 M. Lifshitz\, Electrodynamics of Continuous Media\, Butterworth-Heinemann 
 ed.\, London\, 1984. \n[2] S. I. Shevchenko and A. M. Konstantinov\, JETP 
 Letters\, 109\, 790 (2019).\n[3] S. I. Shevchenko and A. M. Konstantinov\,
  Low Temp. Phys. 46\, 48 (2020).\n\nhttps://indico.bitp.kiev.ua/event/10/c
 ontributions/246/
LOCATION:Online meeting
URL:https://indico.bitp.kiev.ua/event/10/contributions/246/
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