Northwestern University, Evanston, Illinois 60208, USA.
Phys Rev Lett. 2015 Mar 13;114(10):105302. doi: 10.1103/PhysRevLett.114.105302. Epub 2015 Mar 10.
It has been shown that the relative stabilities of various superfluid states of ^{3}He can be influenced by anisotropy in a silica aerogel framework. We prepared a suite of aerogel samples compressed up to 30% for which we performed pulsed NMR on ^{3}He imbibed within the aerogel. We identified A and B phases and determined their magnetic field-temperature phase diagrams as a function of strain. From these results, we infer that the B phase is distorted by negative strain forming an anisotropic superfluid state more stable than the A phase.
已经表明，^{3}He 的各种超流态的相对稳定性可以通过二氧化硅气凝胶骨架中的各向异性来影响。我们制备了一系列压缩至 30%的气凝胶样品，对浸泡在气凝胶中的^{3}He 进行了脉冲 NMR 实验。我们确定了 A 相和 B 相，并确定了它们的磁场-温度相图作为应变的函数。根据这些结果，我们推断 B 相通过负应变而变形，形成比 A 相更稳定的各向异性超流态。
