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Physica B Condensed Matter

Ultrasonic investigation of rotating 3He-B in strong magnetic fields

Antti J. Manninen, Jukka M. Kyynarainen, Kenji Torizuka, Jukka P Pekola

Published Aug 1, 1990• 1 citation
Publisher
DOI
10.1016/0921-4526(90)90726-b

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We have conducted an ultrasonic pulse‐time‐of‐flight investigation of the squashing mode of the superfluid 3He‐B in a magnetic field. All five of the expected Zeeman sublevels for this J=2− mode were observed. The investigation was done at very low temperature (T/Tc<0.35) to reduce the quasi‐particle 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 modes’ 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 experiment at different orientations of the sound propagation with respect to magnetic field direction (parallel, perpendicular, 55 and 13 degrees) was the key to observation of all 5 modes and their identification. The Landé g factor was obtained from the linear dependence of the Jz=+2 mode on magnetic field and compared to theory.