Transverse Acoustic Impedance Measurements for Surface States of Superfluid 3He A1 and A2 Phases

We measured the complex transverse acoustic impedance in both superfluid 3He A1 and A2 phases. This impedance is sensitive to surface states. In our preliminary results, the temperature dependence of the impedance in the A1 phase is similar to that in A phase, and the imaginary part shows an anomaly in the A2 phase. These anomalies occurred at the temperature defined as T k , which is lower as the frequency gets higher. The similar frequency dependence of T k in each phase suggests that the anomaly is attributed to the same origin. The frequency dependence of the T k /T c indicates that the shape of the surface density of each spin pair state did not greatly change in the present experimental temperature range.