The Response of a Mechanical Oscillator at the Superfluid 3He AB Interface

From our long experience of using profiled magnetic fields to stabilize and manipulate the AB phase boundary in superfluid 3He in the zero-temperature limit, we have constructed a cell where we can place the AB interface in the vicinity of a pair of crossed vibrating wire resonators (VWRs). The VWRs provide sensitive mechanical probes of the A and B phase energy gaps and textures. Here we present preliminary resugts where we observe the dynamic response of the VWR at the AB interface.