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Kinetics of merging and breaking down of vortex loops is an important part of vortex tangle dynamics. Another part is the motion of individual lines, which obeys the Biot–Savart law in the presence of friction force and of applied external velocity fields if any. In the present work, we evaluate...
The critical-velocity behavior of oscillatory superfluid 4He flow through a 2 × 2-μm aperture in a 0.1-μm-thick metal foil has been studied from 0.36 to 2.10 K at frequencies from less than 50 Hz up to above 1880 Hz. The pressure remained less than 0.5 bar. In early runs during which the...
The recent high-precision torsional oscillator experiments of Casey et al. involving thin films of normal liquid 3He showed that the film decouples from the substrate with a time constant
which is proportional to T
−1 where T is the absolute temperature. We interpret...
Recently the authors discovered that the suppression of the charge density wave (CDW) ground states by high magnetic fields in the organic conductor series (Per)2M(mnt)2 is followed by additional high field, CDW-like phases. The purpose of this paper is to review these compounds and to consider...
The evolution of semicircular quantum vortex loops in oscillating potential flow emerging from an aperture is simulated in some highly symmetrical cases. As the frequency of potential flow oscillation increases, vortex loops that are evolving so as eventually to cross all of the streamlines of...
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