3He effect on 2D superfluidity in 3He-4He mixture films on planar gold
3He effect on 2D superfluidity in 3He-4He mixture films on planar gold
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3He 对平面金上 3He-4He 混合物薄膜二维超流性的影响
DOI：
10.1007/s10909-012-0792-3
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发表时间：
2013
影响因子：
2
通讯作者：
and N. Wada
中科院分区：
文献类型：
--
作者：
H. Yamaguchi;T. Oda;M. Hieda;T. Matsushita;and N. Wada
已经有大量的实验探索二维超流性的本质和各种衬底上的3 He-4 He混合物膜的结构。到目前为止，一个可能的膜结构在T =0是一个简单的层模型，3 He/超流4 He/固体状4 He/衬底，其中的亚单层超流性的强烈影响的覆盖3 He覆盖层。然而，其机制尚未完全理解。本文用QCM方法在60 MHz频率上研究了3 He对金表面混合膜超流性的影响，主要研究了超流密度σs随温度变化的反常损耗。在测量中，我们保持3 He覆盖率恒定（n3= 0，3.6，7.2，19.0，57.2或92.8 μmol/m2），然后递增地添加4 He。我们观察到随着3 He覆盖度的增加，3 He效应对σs（T）的演化，σs（T）的这种损耗迅速增加，然后在n3 ~（-1）层附近饱和。从分析的线性温度区的散逸峰temperatureTpas的函数的超流4 He coveragen 4和比较与以前的研究聚酯薄膜和多孔金，我们发现了一个通用的函数的强度的3 He效应的所有基板。
There have been a number of experiments exploring the nature of 2D superfluidity and the configuration of3He–4He mixture films on various substrates. To date, a possible film-structure atT=0 is that of a simple layer model,3He/superfluid4He/solid-like4He/substrate, in which the submonolayer superfluidity is strongly affected by the coverage of the3He overlayer. Yet the mechanism is not been fully understood. In this paper, we report a QCM study at 60 MHz for the3He effect on the superfluidity of mixture films on flat gold, mainly focusing on the anomalous depletion of the temperature dependence of the superfluid densityσs. In the measurements, we kept the3He coverage constant (n3= 0, 3.6, 7.2, 19.0, 57.2, or 92.8 μmol/m2) and then incrementally added4He. We observed the evolution of the3He effect onσs(T) with increasing3He coverage; this depletion ofσs(T) rapidly increases and then saturates nearn3∼1 layer. From the analysis of the linear-temperature region in the plot of the dissipation peak temperatureTpas a function of the superfluid4He coveragen4sand comparison with previous studies on Mylar and porous gold, we found a universal function for the strength of the3He effect for all substrates.