The features of the collective modes in aerogels filled with superfluid helium

Автор(и)

  • A.A. Zadorozhko B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • V.K. Chagovets B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • E.Ya. Rudavskii B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • G.A. Sheshin B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • Sh.E. Kekutia Institute of Cybernetics, 5 Sandro Euli, Tbilisi 0186, Georgia
  • N.D. Chkhaidze Institute of Cybernetics, 5 Sandro Euli, Tbilisi 0186, Georgia
  • N. Mulders Department of Physics and Astronomy of Delaware, Newark, Delaware 19716, USA

DOI:

https://doi.org/10.1063/1.3253393

Ключові слова:

superfluid helium, aerogel, acoustic collective modes.

Анотація

The velocity of fast and slow collective modes of 90, 94 and 98% porosity aerogels filled with superfluid helium were measured by means of low-frequency resonant technique at temperatures 0.5–2.5 K. The temperature dependences of velocities of both modes are compared with the hydrodynamic theory which was modified taking into account the mobility of the aerogel matrix, porosity of media and tortuosity of an acoustic way. It has been found that the fast and slow modes in an aerogel are coupled much stronger than the first and second sounds in bulk He II.

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Опубліковано

2009-08-28

Як цитувати

(1)
Zadorozhko, A.; Chagovets, V.; Rudavskii, E.; Sheshin, G.; Kekutia, S.; Chkhaidze, N.; Mulders, N. The Features of the Collective Modes in Aerogels Filled With Superfluid Helium. Fiz. Nizk. Temp. 2009, 35, 962-967.

Номер

Том 35 № 10 (2009)

Розділ

Квантові рідини та квантові кристали

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