STUDY ON THE SURFACE OF SUPERFLUID ^3He BY 2D ELECTRONS AND IONS

本文利用表面2D电子的声子共振和表面下离子的电导率研究了超流~3He表面。在500 MHz附近测量了声子共振，观察到线宽减小到70mK以下。这一事实表明在~3He上出现了新的表面模。对电子密度和磁场的依赖关系进行了系统的研究，首次成功地测量了~3He自由表面下的离子电导率。数据表明，这与以前在块体~3He中获得的实验结果符合得很好。超流转变是通过离子电导率来检测的。为研究超流体在地表的有序参数的空间变化奠定了良好的实验基础。

This is a study of superfluid ^3He surface by means of the phonon resonance of 2D electrons on the surface and the conductivity of ions underneath the surface.Phonon resonace in the frequency range around 500MHz is measured and a reduction of the linewidth is observed below 70 mK.This fact is suggesting the appearance of a new surface mode on ^3He. Electron density and magnetic field dependence should be incestigated systematically in future.Ion conductivity is successfully measured underneath the free surface of liquid ^3He, for the first time. Data show a good coincidence with the previous experimental results obtained in bulk ^3He. Superfluid transition is detected by the ion conductivity. We established a good experimental basis for the study of spatial variation of the order parameter of superfluid ^<32>He at the surface.