Observation of a textural transformation associated with the A2-transition in superfluid 3He-A.
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We have observed an anomaly in the attenuation and phase velocity of zero sound in superfluid He3-A at a temperature experimentally unresolvable from the A2 transition. The feature is present at all magnetic fields and frequencies for sound propagated perpendicular to the applied field H, but it disappears for sound traveling along H. We discuss this phenomenon in terms of a first-order transformation between dipole-locked and dipole-unlocked planar textures driven by the thermodynamic second-order phase transition at TA2. We also report the first observed splitting of the normal flapping mode in a magnetic field. 1986 The American Physical Society.
author list (cited authors)
de Vegvar PG, .., Movshovich, R., Ziercher, E. L., & Lee, D. M.
complete list of authors
Movshovich, R||Ziercher, EL||Lee, DM