Fivefold splitting of the squashing collective mode of superfluid 3He-B by a magnetic field.
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We have conducted an ultrasonic pulse-time-of-flight investigation of the squashing mode of superfluid B3 in a magnetic field. All five of the expected Zeeman sublevels for this J=2- mode were observed. The investigation was done at a very low temperature (T/Tc<0.35) to reduce the quasiparticle broadening that tends to smear the collective modes and makes resolution of the individual sublevels impossible. Variation of the pressure was used to sweep the collective-mode frequencies through the operating frequency, 137.6 MHz of the resonant-sound transducers. Both group-velocity spectroscopy and pulse-shape analysis were used for identification of different sublevels. Performing experiments at different orientations of the sound propagation with respect to magnetic-field direction (parallel, perpendicular, 55, and 13) was the key to observation of all five modes and their identification. The Land g factor was obtained from the linear dependence of the Jz=+2 sublevel on magnetic field and compared with theory. 1991 The American Physical Society.
