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Collective Modes of Super fluid 3He in High Fields: Group Velocity of High Frequency Sound in Super fluid 3He–B

Measurements of attenuation and group velocity of pulsed high frequency sound have been performed up to 137.6 MHz in superfluid 3He-B near the squashing mode of the order parameter. Passage through the collective mode was accomplished by sweeping pressure. The group velocity has been observed to decrease by more than a factor of 15 from the zero-sound velocity. The width of the squashing mode was seen to increase with magnetic field, as inferred from the group velocity data, making it the first observation of an effect of splitting of this mode in magnetic field.