mriselMagnetic Resonance in SolidsMagnetic Resonance in Solids2072-5981Kazan Federal Universitymrisel-236Research ArticleСтатьиOn the sound propagation in silica aerogels filled in by normal and superfluid helium (in English)TayurskiiD. A.

420008 Kazan; Kanazawa, 920-1192, Japan 

MatsumotoK.

Kanazawa, 920-1192

Kazan State University; Kanazawa UniversityRussian FederationKanazawa UniversityJapan20042201202461Special Issue213220Copyright © Tayurskii D.A., Matsumoto K., 20242024Tayurskii D.A., Matsumoto K.Tayurskii D.A., Matsumoto K.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.mrsej.ru/jour/article/view/236

Earlier obtained experimental data concerning sound propagation in silica aerogels filled in by liquid 4He are theoretically analyzed for normal as well as superfluid phase. The simple phenomenological model is proposed for normal phase. The data for superfluid phase are described in a rather good manner by the hydrodynamic theory with taking into account the clamping of normal component by silica strands. It is shown also that at temperatures below 1 K one needs a new hydrodynamic theory in which momentum transfer between aerogel and phonons in liquid helium should be taken into account

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The authors declare that there are no conflicts of interest present.