Torsional oscillator experiment on superfluid 4He confined in a porous alumina nanopore array
Torsional oscillator experiment on superfluid 4He confined in a porous alumina nanopore array
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多孔氧化铝纳米孔阵列中限制的超流体 4He 扭转振荡器实验
DOI：
10.1088/1742-6596/400/1/012053
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Y Shibayama and K Shirahama
中科院分区：
文献类型：
--
作者：
S Murakawa;R Higashino;K Yoshimura;Y Chikazawa;T Tanaka;K Kuriyama;K Honda;Y Shibayama and K Shirahama
我们研究了液体4 - He在多孔氧化铝（PA）直线型纳米孔中的超流动性。将孔径为45 nm的PA板样品置于环形流道中，利用扭转振子（TO）技术检测超流。在体λ点处，纳米孔内的超流转变温度被抑制了3.5 mK。温度与愈合长度等于孔隙半径时的温度一致。我们已经观察到许多与耗散峰相关的反交叉异常，这归因于与第二声共振的耦合。
We studied superfluidity of liquid 4 He confined in an array of well-characterized straight nanopores of porous alumina (PA). The PA plate sample of 45 nm pore size is set in an annular flow channel and the superflow is detected by torsional oscillator (TO) technique. Superfluid transition T c in the nanopores is suppressed by 3.5 mK from the bulk λ point. T c is consistent with the temperature at which the healing length is equal to the pore radius. We have observed many anti-crossing anomalies in the TO frequency associated with dissipation peaks, which are attributed to the coupling to second sound resonances.