Spin fluid dynamics observed by magnetic fountain effect and mechanical spin pumping effect in the ferromagnetic superfluid He-3 A1 phase
Spin fluid dynamics observed by magnetic fountain effect and mechanical spin pumping effect in the ferromagnetic superfluid He-3 A1 phase
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通过磁喷泉效应和机械自旋泵浦效应观察铁磁超流体He-3 A1相中的自旋流体动力学
DOI：
10.1103/physrevb.82.054527
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
and H. Kojima
中科院分区：
文献类型：
--
作者：
Y. Aoki;A. Yamaguchi;K. Suzuki;H. Ishimoto;and H. Kojima
在一个新建造的装置中，对超流体中磁产生的喷泉压力进行了系统的观测，该装置旨在减少热梯度的影响。在同一装置中，极化核自旋的机械抽运和过滤通过静电致动膜的气动抽运作用来实现。在这两个实验中，所测量的感应压力被观察到衰减在所有的温度下，其中thepase出现在磁场高达13 T和液体压力之间的1和29巴。推测的自旋弛豫速率随低温相界的接近而增大。自旋弛豫速率的增加可以用Monien和Tewordt预测的相内存在少数自旋凝聚以及Leggett-Takagi理论在超流体中的应用来解释。
Systematic observations of the magnetically generated fountain pressure in the superfluidhave been carried out in a newly built apparatus designed to reduce the effect of thermal gradients. In the same apparatus, mechanical pumping and filtering of polarized nuclear spins were realized by the pneumatic pumping action of an electrostatically actuated membrane. In both experiments, the measured induced pressure was observed to decay at all temperatures where thephase appeared in magnetic fields up to 13 T and liquid pressures between 1 and 29 bar. The inferred spin-relaxation rate tended to increase as the low-temperature phase boundary with thephasewas approached. The increase in spin-relaxation rate nearcan be explained by the presence of a minority spin condensate in thephase as predicted by Monien and Tewordt and by the application of the Leggett-Takagi theory of spin relaxation in superfluid.