Measurements of the attenuation and velocity of pulsed high-frequency sound have been performed up to 133 MHz in superfluid He3-B. A new collective mode of the order parameter was discovered at a frequency extrapolated to Tc of =(1.165+0.05)BCS(Tc), where BCS(T) is the energy gap in the weak-coupling BCS theory. The group velocity has been observed to decrease by as much as 23 of the zero-sound velocity.
ASJC Scopus subject areas
- Physics and Astronomy(all)