Mutual friction in superfluid He- B 3 in the low-temperature regime

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Mutual friction in superfluid He- B 3 in the low-temperature regime. / Mäkinen, J. T.; Eltsov, V. B.

julkaisussa: Physical Review B, Vuosikerta 97, Nro 1, 014527, 29.01.2018, s. 1-7.

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

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Bibtex - Lataa

@article{474f2cc4064849bcbaac390347f5157d,
title = "Mutual friction in superfluid He- B 3 in the low-temperature regime",
abstract = "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.",
author = "M{\"a}kinen, {J. T.} and Eltsov, {V. B.}",
year = "2018",
month = "1",
day = "29",
doi = "10.1103/PhysRevB.97.014527",
language = "English",
volume = "97",
pages = "1--7",
journal = "Physical Review B (Condensed Matter and Materials Physics)",
issn = "2469-9950",
publisher = "American Physical Society",
number = "1",

}

RIS - Lataa

TY - JOUR

T1 - Mutual friction in superfluid He- B 3 in the low-temperature regime

AU - Mäkinen, J. T.

AU - Eltsov, V. B.

PY - 2018/1/29

Y1 - 2018/1/29

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85041136896&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.97.014527

DO - 10.1103/PhysRevB.97.014527

M3 - Article

VL - 97

SP - 1

EP - 7

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

SN - 2469-9950

IS - 1

M1 - 014527

ER -

ID: 17473553