Abstract
Vortex dynamics of superfluid 4 He films in porous glass has been investigated with torsional oscillator technique under rotation. In addition to the 2D vortex dissipation peak, a new dissipation peak near the superfluid phase transition is found. Its dependence on the rotation velocity as well as on the temperature is studied. The rotation speed dependence of the Q value at the new peak traces no hysteresis through one rotation sweep cycle. This is argued as a mobility of 3D vortex lines which increases with increasing temperature. The temperature dependence of the mobility could be interpreted as melting of the vortex solid.
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