Rotation-induced 3D vorticity in 4He superfluid films adsorbed on a porous glass

Details Rotation-induced 3D vorticity in 4He superfluid films adsorbed on a porous glass Rotation-induced 3D vorticity in 4He superfluid films adsorbed on a porous glass

2004-05-05

arxiv.org/abs/cond-mat/0405092v2

Physics

Condensed Matter

Other Condensed Matter

4pages, 5figures

Scientific paper

10.1103/PhysRevB.71.212502

Detailed study of torsional oscillator experiments under steady rotation up to 6.28 rad/sec is reported for a 4He superfluid monolayer film formed in 1 micrometer-pore diameter porous glass. We found a new dissipation peak with the height being in proportion to the rotation speed, which is located to the lower temperature than the vortex pair unbinding peak observed in the static state. We propose that 3D coreless vortices ("pore vortices") appear under rotation to explain this new peak. That is, the new peak originates from dissipation close to the pore vortex lines, where large superfluid velocity shifts the vortex pair unbinding dissipation to lower temperature. This explanation is confirmed by observation of nonlinear effects at high oscillation amplitudes.

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