Abstract
The superfluid density ρ s in the presence of persistent current(v n −v s ≠0) is investigated using the Doppler-shifted fourth-sound technique. In the vortex-free Landau state, ρ s remains constant within our experimental resolution of two parts in 105. This is not inconsistent with a theoretical prediction by Khalatnikov. Where vortices are present outside the Landau region, a fractional change in ρ s becomes as large as 1.2%, depending on rotation velocity and temperature, and shows a relatively complex hysteresis behavior.
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This research is supported by NSF and ONR.
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Kojima, H., Veith, W., Guyon, E. et al. Superfluid density in the presence of persistent current in superfluid4He. J Low Temp Phys 25, 195–217 (1976). https://doi.org/10.1007/BF00654829
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DOI: https://doi.org/10.1007/BF00654829