Superfluid transition and vortex dynamics in submonolayer superfluid super(4)He films in porous glass under rotation

A combination of a rotating dilution refrigerator and high-Q torsional oscillator technique has been used to study dynamics of vortices in thin super(4)He films adsorbed on the porous glass (d identical with 1 mu m pore size). Under rotation an additional dissipation peak with the amplitude proporti...

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Bibliographic Details
Published in:Journal of low temperature physics 1998-11, Vol.113 (3-4), p.417-422
Main Authors: Fukuda, M, Zalalutdinov, M K, Kovacik, V, Igarashi, T, Obata, T, Ooyama, K, Kubota, M
Format: Article
Language:English
Subjects:
Adsorption
Glass
Low temperature effects
Monolayers
Phase transitions
Porous materials
Rotation
Three dimensional
Vortex flow
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Summary:A combination of a rotating dilution refrigerator and high-Q torsional oscillator technique has been used to study dynamics of vortices in thin super(4)He films adsorbed on the porous glass (d identical with 1 mu m pore size). Under rotation an additional dissipation peak with the amplitude proportional to the angular velocity is seen at the middle of the superfluid transition, on the low temperature side of the stationary peak which is present even at Omega identical with 0. We attribute this peak to the 3D type vortices created in multiply connected super(4)He film by the rotation. Peak shape of the rotation-induced dissipation could be interpreted as a freezing of the 3D vortices well below T sub(c).
ISSN:0022-2291