The nonclassical 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 fractions are 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
〓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, not amplitude or acceleration.
各種検索
サポート
ヘルプ