Sato T, Kunimatsu T, Izumina K, Matsubara A, Kubota M, Mizusaki T, Bunkov Yu M
Institute for Solid State Physics, The University of Tokyo, Chiba, Japan.
Phys Rev Lett. 2008 Aug 1;101(5):055301. doi: 10.1103/PhysRevLett.101.055301.
We report the first observation of coherent precession of magnetization in superfluid 3He A-like phase (CP-A) in aerogel. The coherent precession in bulk 3He A-phase is unstable due to the positive feedback of spin supercurrent to the gradient of phase of precession. It was predicted that the homogeneous precession will be stable if the orbital momentum of the 3He A-phase can be oriented along the magnetic field. We have succeeded to prepare this configuration by emerging 3He in uniaxially deformed anisotropic aerogel. The dissipation rate of coherent precession states in aerogel is much larger than that in bulk 3He B-phase. We propose a mechanism of this dissipation.
我们报道了在气凝胶中超流3He A类相（CP - A）中磁化强度相干进动的首次观测结果。由于自旋超流对进动相位梯度的正反馈，体3He A相中的相干进动是不稳定的。据预测，如果3He A相的轨道动量能够沿磁场方向取向，均匀进动将是稳定的。我们通过将3He注入单轴变形的各向异性气凝胶成功制备了这种构型。气凝胶中相干进动态的耗散率比体3He B相中的耗散率大得多。我们提出了这种耗散的一种机制。
