ACOUSTIC SPECTROSCOPY OF SUPERFLUID 3HE IN AEROGEL
ACOUSTIC SPECTROSCOPY OF SUPERFLUID 3HE IN AEROGEL
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气凝胶中超流体 3HE 的声学光谱
DOI：
10.1103/physrevlett.82.3492
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发表时间：
1999
影响因子：
8.6
通讯作者：
N. Mulders
中科院分区：
文献类型：
--
作者：
A. Golov;D. Geller;J. Parpia;N. Mulders
98%多孔气凝胶中的液态3 He同时具有无序p波超流体和弹性固体的性质。我们在气凝胶中观察到了超流~ 3 He的两种声模。第一个（快）声音是压缩波，第二个（慢）声音是超流体和耦合到弹性气凝胶基质的法向分量的异相振荡。慢声速的测量允许超流分数的准确测定。
Liquid 3He in 98%-porous aerogel simultaneously possesses properties of a disordered p-wave superfluid and an elastic solid. We have observed two sound modes of superfluid 3He in aerogel. The first (fast) sound is a compression wave, and the second (slow) sound is the out-of-phase oscillation of the superfluid and the normal component that is coupled to the elastic aerogel matrix. A measurement of the slow sound velocity allows an accurate determination of the superfluid fraction.