超流~ 3 He中的振荡气凝胶
Oscillating nematic aerogel in superfluid 3He
摘要：
本文介绍了气凝胶在超流$^3$ He中振荡的实验研究。该气凝胶由几乎平行的莫来石股线组成，并连接到沿着股线方向移动的振动线上。以前的核磁共振实验表明，在类似的气凝胶样品中的$^3$ He的超流转变发生到极性相和转变温度（$T_{ca}$）只是稍微抑制相对于块体$^3$ He的超流转变温度。在目前的实验中，我们观察到在$T=T_{ca}$的振动线的谐振特性的变化，并发现，低于$T_{ca}$的一个额外的谐振模式被激发耦合到主谐振。
英文摘要：
We present experiments on nematic aerogel oscillating in superfluid $^3$He. This aerogel consists of nearly parallel mullite strands and is attached to a vibrating wire moving along the direction of the strands. Previous nuclear magnetic resonance experiments in $^3$He confined in similar aerogel sample have shown that the superfluid transition of $^3$He in aerogel occurs into the polar phase and the transition temperature ($T_{ca}$) is only slightly suppressed with respect to the superfluid transition temperature of bulk $^3$He. In present experiments we observed a change in resonant properties of the vibrating wire at $T=T_{ca}$ and found that below $T_{ca}$ an additional resonance mode is excited which is coupled to the main resonance.
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