Five-fold splitting of the squashing collective mode and the pair-breaking edge of superfluid 3He-B in a magnetic field
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abstract
We have conducted an ultrasonic pulse-time-of-flight investigation of the squashing mode and pair-breaking edge of the superfluid 3He-B in a magnetic field. All five of the expected Zeeman sublevels for the squashing mode were observed. The investigation was done at a very low temperature ( T Tc < 0.35) to reduce the quasiparticle broadening. Group velocity spectroscopy, pulse-shape analysis and anisotropy of coupling of the squashing mode to ultrasound with respect to the magnetic field direction were used for identification of different Zeeman sublevels. The Land g factor was obtained from the linear dependence of the Jz = +2 mode on magnetic field and compared with theory. The investigation of the pair-breaking edge was performed at pressures between 6 and 29.3 bar, and ultrasound frequencies of 168.33, 137.6 and 107 MHz. We used both depressurization and demagnetization techniques to measure the linear and quadratic magnetic field dependence of the pair-breaking-edge frequency. We obtain values for the Fermi liquid interaction parameter Fa2 from the coefficient of the linear term. The quadratic term is due to the energy gap distortion and its value is consistent with calculations of Schopohl and Tewordt. 1992.
