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Supersolid ⁴He under DC rotation: Energy dissipation for slow and fast temperature sweeps

Gumann, P. ; Shimizu, N. ; Penzev, A. ; Yasuta, Y. ; Kubota, M. (2024)
Supersolid ⁴He under DC rotation: Energy dissipation for slow and fast temperature sweeps.
In: Journal of Physics: Conference Series, 2009, 150 (3)
doi: 10.26083/tuprints-00020681
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Item Type: Article
Type of entry: Secondary publication
Title: Supersolid ⁴He under DC rotation: Energy dissipation for slow and fast temperature sweeps
Language: English
Date: 30 January 2024
Place of Publication: Darmstadt
Year of primary publication: 1 February 2009
Place of primary publication: Bristol
Publisher: IOP Publishing
Journal or Publication Title: Journal of Physics: Conference Series
Volume of the journal: 150
Issue Number: 3
Collation: 4 Seiten
DOI: 10.26083/tuprints-00020681
Corresponding Links:
Origin: Secondary publication DeepGreen

In this report, we describe torsional oscillator (TO) measurements under DC rotation of a 49 bar 4He-sample, at Vac = 0.2 mm/s. We investigated the behavior of the energy dissipation (∼ ΔQ⁻¹) as well as the supersolid fraction for different rotation velocities (0 < Ω < 1.256 rad/s) and Vac = 0.06, 0.2 mm/s in the temperature range of from 47 mK to 150 mK, using fast (∼3h) and slow (∼ 55h) temperature sweeps. Variation of Ω did not influence the supersolid fraction. The performed analyzes have shown a linear increase of the ΔQ⁻¹ vs. Ω for high Vac = 0.2 mm/s (for fast and slow temperature sweeps). In the case of Vac = 0.06 mm/s, no change of the energy dissipation was observed up to Ω = 0.628 rad/s for the low temperature limit. These results suggest a possible explanation for the energy dissipation in supersolid ⁴He and its proportionality to the number of low dimensional vortices influenced by torsional oscillations. The 3D-vortex lines created by DC rotation can dissipate their energy by interaction with low dimensional vortices. Their dynamics under rotation are characterized by long relaxation times.

Identification Number: Artikel-ID: 032026
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-206810
Additional Information:

25th International Conference on Low Temperature Physics (LT25)

Classification DDC: 500 Science and mathematics > 530 Physics
Divisions: 05 Department of Physics > Institute for Condensed Matter Physics
Date Deposited: 30 Jan 2024 13:09
Last Modified: 05 Feb 2024 08:50
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20681
PPN: 515231584
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