Oscillation Frequency Dependence of Non-Classical Rotation Inertia of Solid ${}^4$He

Abstract

The non-classical rotational inertia fraction of the identical cylindrical solid ${}^4$He below 300 mK is studied at 496 and 1173 Hz by a double resonance torsional oscillator. Below 35 mK, the fraction is the same at sufficiently low rim velocities. Above 35 mK, the fraction is greater for the higher than the lower mode. The dissipation peak of the lower mode occurs at a temperature $\sim$ 4 mK lower than that of the higher mode. The drive dependence of the two modes shows that the reduction of the fraction is characterized by critical velocity, \textit{not} amplitude nor acceleration.

4 pages, 4 figures

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