The A-B transition in superfluid helium-3 under confinement in a thin slab geometry.
The A-B transition in superfluid helium-3 under confinement in a thin slab geometry.
复制标题
DOI：
10.1038/ncomms15963
复制
发表时间：
2017-07-03
影响因子：
16.6
通讯作者：
Parpia JM
中科院分区：
文献类型：
--
作者：
Zhelev N;Abhilash TS;Smith EN;Bennett RG;Rojas X;Levitin L;Saunders J;Parpia JM
用扭摆方法研究了约束对超流氦-3相态的影响。我们重点研究了A相和B相之间的相变，其中A相通过约束稳定，并且在A - B相边界处预测了空间调制的条纹相。本文讨论了将超流体氦-3装入高精度扭摆的1.08 μm厚纳米流体腔内的结果，并绘制了0.1 ~ 5.6 bar的相图。我们观察到只有小的过冷的A相，相比于散装或气凝胶限制时，有证据表明非单调的压力依赖。这表明b相核成核机制在约束下起作用。相图和A相和B相的相对超流分数都表明，在所有压力下都存在强耦合，这意味着条纹相的稳定性。超流体氦-3为理解量子相及其转变提供了一个干净的试验场。本文作者表明，当氦被限制在纳米流体腔中时，一阶a - b跃迁的过冷被抑制，这表明了一种内在的成核机制。
The influence of confinement on the phases of superfluid helium-3 is studied using the torsional pendulum method. We focus on the transition between the A and B phases, where the A phase is stabilized by confinement and a spatially modulated stripe phase is predicted at the A–B phase boundary. Here we discuss results from superfluid helium-3 contained in a single 1.08-μm-thick nanofluidic cavity incorporated into a high-precision torsion pendulum, and map the phase diagram between 0.1 and 5.6 bar. We observe only small supercooling of the A phase, in comparison to bulk or when confined in aerogel, with evidence for a non-monotonic pressure dependence. This suggests that an intrinsic B-phase nucleation mechanism operates under confinement. Both the phase diagram and the relative superfluid fraction of the A and B phases, show that strong coupling is present at all pressures, with implications for the stability of the stripe phase. Superfluid helium-3 provides a clean testing ground for the understanding of quantum phases and their transitions. Here the authors show that when helium is confined in a nanofluidic cavity supercooling across the first-order A–B transition is suppressed, indicating an intrinsic nucleation mechanism.
登录
查看更多内容
影响因子：
8.6
作者：
Dmitriev, V. V.;Senin, A. A.;Yudin, A. N.
通讯作者：
Yudin, A. N.
影响因子：
8.6
作者：
Bradley, D. I.;Fisher, S. N.;Tsepelin, V.
通讯作者：
Tsepelin, V.
影响因子：
8.6
作者：
Bartkowiak, M;Fisher, SN;Skyba, P
通讯作者：
Skyba, P
影响因子：
8.6
作者：
Bianchi, A;Movshovich, R;Sarrao, JL
通讯作者：
Sarrao, JL
影响因子：
8.6
作者：
Bennett, R. G.;Zhelev, N.;Parpia, J. M.
通讯作者：
Parpia, J. M.