Ultrasonic Spectroscopy of the Real Squashing Mode in Rotating (3)He-B

摘要

Response of the real squashing mode to rotation has been studied in (3)He-B at pressures below 12 bar and in magnetic fields up to 40 mT. Attenuation peaks of all five substates become visible under rotation. A clear asymmetry between the peak heights, corresponding to positive and negative m(J), has been observed. The doublet splitting of the center peak has been measured. The counterflow-induced coupling of the real squashing mode to zero sound was not seen and must thus be at least four times weaker than predicted. The data are compared with recent theories.