在固态$^4$ He中退火
Annealing in solid $^4$He
摘要：
我们用一个共振频率为185 Hz的方形截面扭转振子来证实Kim和Chan \cite{1,2}发现的非经典转动惯量。我们还发现了一个强相关的NCRI信号和高耗散Q $^{-1}$的4 $\times$ 10 $^{-6}$以上的转变温度的振荡。在这里，我们展示了在26 bar压力下在$^{4}$ He中退火过程的初步结果。当保持温度恒定在1 K以上时，我们观察到周期立即上升，耗散缓慢衰减。Q $^{-1}$的平衡值随温度的升高而降低。
英文摘要：
We have used a torsional oscillator with square cross section and a resonance frequency of 185 Hz to confirm the nonclassical rotational inertia (NCRI) discovered by Kim and Chan\cite{1,2}. We have also found a strong correlation between the NCRI signal and a high dissipation Q$^{-1}$ of 4 $\times$ 10$^{-6}$ of the oscillation above the transition temperature. Here, we present preliminary results of the annealing process in $^{4}$He at a pressure of 26 bar. When holding the temperature constant above 1 K we have observed a immediate rise in the period and a slow decay of the dissipation. The equilibrium value of Q$^{-1}$ decreases with increasing temperature.
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