论文标题
磁散射对列在列前气凝胶中3HE超氟的影响
Effect of Magnetic Scattering on Superfluid Transition of 3He in Nematic Aerogel
论文作者
论文摘要
我们介绍了纯$^3 $ HE（在没有$^4 $覆盖的情况下）中的高磁场实验的结果。在这种情况下，气凝胶链覆盖着很少的固体顺磁性$^3 $ HE的原子层，这使旋转交换机制以$^3 $ He quasiparticles散射。我们较早的NMR实验表明，在低场中而不是极相，A相预计将在列凝胶中出现。我们使用振动的电线谐振器与附着在其上的气凝线样品，并测量谐振器在不同磁场处的共振特性的温度依赖性。从实验中获得的$^3 $ HE的超氟转型温度在应用磁场中非线性增加。与批量A $ _1 $相比，这种增加被抑制了，我们将其归因于磁散射通道的影响，磁散射通道的影响是从理论上考虑到他限制在各向同性硅胶中的$^3 $的情况下。但是，我们观察到具有理论期望的基本定量不匹配。
We present results of high magnetic field experiments in pure $^3$He (in the absence of $^4$He coverage) in nematic aerogel. In this case the aerogel strands are covered with few atomic layers of solid paramagnetic $^3$He, which enables the spin-exchange mechanism for $^3$He quasiparticles scattering. Our earlier NMR experiments showed that in low fields, instead of the polar phase, the A phase is expected to emerge in nematic aerogel. We use a vibrating wire resonator with the sample of aerogel attached to it and measure temperature dependencies of resonance properties of the resonator at different magnetic fields. A superfluid transition temperature of $^3$He in aerogel, obtained from the experiments, increases nonlinearly in applied magnetic field. And this increase is suppressed compared with that for bulk A$_1$ phase, which we attribute to an influence of the magnetic scattering channel, previously considered theoretically for the case of $^3$He confined in isotropic silica aerogel. However, we observe the essential quantitative mismatch with theoretical expectations.
