Projekteja vuodessa
Abstrakti
We measure the response of a rotating sample of superfluid He-B3 to spin-down to rest in the zero-temperature limit. Deviations from perfect cylindrical symmetry in the flow environment cause the initial response to become turbulent. The remaining high polarization of vortices along the rotation axis suppresses the turbulent behavior and leads to laminar late-time response. We determine the dissipation during laminar decay at (0.13-0.22)Tc from the precession frequency of the remnant vortex cluster. We extract the mutual friction parameter α and confirm that its dependence on temperature and pressure agrees with theoretical predictions. We find that the zero-temperature extrapolation of α has pressure-independent value α(T=0)∼5×10-4, which we attribute to a process where Kelvin waves, excited at surfaces of the container, propagate into the bulk and enhance energy dissipation via overheating vortex core-bound fermions.
Alkuperäiskieli | Englanti |
---|---|
Artikkeli | 014527 |
Sivut | 1-7 |
Julkaisu | Physical Review B |
Vuosikerta | 97 |
Numero | 1 |
DOI - pysyväislinkit | |
Tila | Julkaistu - 29 tammik. 2018 |
OKM-julkaisutyyppi | A1 Julkaistu artikkeli, soviteltu |
Sormenjälki
Sukella tutkimusaiheisiin 'Mutual friction in superfluid He- B 3 in the low-temperature regime'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.Projektit
- 1 Päättynyt
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Matalien lämpötilojen kvantti-ilmiöiden ja komponenttien huippuyksikkö
Hietala, N., Mäkinen, J., Eltsov, V., Volovik, G. & Rysti, J.
01/01/2015 → 31/12/2017
Projekti: Academy of Finland: Other research funding
Laitteet
Lehtileikkeet
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Friction found where there should be none: In superfluids near absolute zero ...
Vladimir Eltsov & Jere Mäkinen
05/02/2018
1 kohde/ Medianäkyvyys
Lehdistö/media: Esiintyminen mediassa
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Friction found where there should be none—in superfluids near absolute zero
Vladimir Eltsov & Jere Mäkinen
01/02/2018 → 02/02/2018
2 kohdetta/ Medianäkyvyys
Lehdistö/media: Esiintyminen mediassa
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Friction found where there should be none: In superfluids near absolute zero
Vladimir Eltsov & Jere Mäkinen
01/02/2018
2 kohdetta/ Medianäkyvyys
Lehdistö/media: Esiintyminen mediassa