Rotation-induced three-dimensional vorticity in He4 superfluid films adsorbed on a porous glass

M. Fukuda, M. K. Zalalutdinov, V. Kovacik, T. Minoguchi, T. Obata, M. Kubota, and E. B. Sonin
Phys. Rev. B 71, 212502 – Published 16 June 2005

Abstract

A detailed study of torsional oscillator experiments under steady rotation up to 6.28radsec is reported for a He4 superfluid monolayer film formed in 1μm-pore-diameter porous glass. We discovered a new dissipation peak, whose height changes in proportion to the angular speed. The new peak appears at a temperature lower than the vortex pair unbinding peak observed in the static state. A model of three-dimensional (3D) coreless vortices (“pore vortices”) is proposed to explain this additional peak in terms of 2D vortex pair dynamics in the presence of a flow field caused by 3D vortices. The new peak originates from dissipation close to the pore vortex lines, where a large superfluid velocity shifts the vortex pair unbinding dissipation to lower temperature. This explanation is consistent with the observation of nonlinear effects at high oscillation amplitudes.

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  • Received 1 March 2005

DOI:https://doi.org/10.1103/PhysRevB.71.212502

©2005 American Physical Society

Authors & Affiliations

M. Fukuda1,*, M. K. Zalalutdinov1,†, V. Kovacik1,‡, T. Minoguchi2, T. Obata1, M. Kubota1, and E. B. Sonin1,3

  • 1Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 2Institute of Physics, University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8902, Japan
  • 3Racah Institute of Physics, Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904, Israel

  • *Present address: Central Research Lab., Hitachi Co. Ltd., Kokubunji, Tokyo 185-8601, Japan.
  • Present address: Physics Dept., Clark Hall, G-4, Cornell University, Ithaca, NY 14853, USA.
  • Present address: KOHZU Precision Co. Ltd., 2-6-15 Kurigi, Asao-ku, Kawasaki, 215-8521, Japan.

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Vol. 71, Iss. 21 — 1 June 2005

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