TEXTURE DEFORMATION BY OSCILLATORY SUPERFLOW IN SUPERFLUID-HE-3-A(1)

The resonant response of spin-entropy (second sound) wave was studied in cylindrical chamber filled with superfluid He-3 A(1) in magnetic fi elds applied either parallel or perpendicular to the chamber axis. In the perpendicular orientation and when the drive level is low, the obs erved response is nonlinear and depends on the direction of frequency sweep. When the drive level is increased, surprisingly, the response b ecomes linear. The nonlinear effects are not observed in the parallel field orientation.