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Stability of Laminar and Turbulent Flow of Superfluid ⁴He at mK Temperatures around an Oscillating Microsphere

Niemetz, M. ; Schoepe, Wilfried


The flow of superfluid helium around a vibrating microsphere is investigated at temperatures between 1 K and 25 mK. At small oscillation amplitudes pure potential flow is observed, the linear drag force on the sphere being determined only by ballistic quasiparticle scattering below 0.7 K with phonons contributing exclusively below 0.5 K. At larger oscillation amplitudes a strongly nonlinear drag ...


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