Low-frequency dynamics of HPD at low pressures

Experimental study of low-frequency oscillation modes of a domain wall betw een the homogeneously precessing domain (HPD) and the stationary domain (SD ) in superfluid He-3-B is presented. Measurements were performed in the tem perature range from 0.5T(c) to 0.8T(c) and at a pressure of 2.7 bar. The sm all signal of the low-frequency domain wall oscillations on the high-freque ncy background (the HPD excitation) was measured using an RF-detector and a low-frequency filter in combination with a low-frequency lock-in amplifier . This technique makes it possible to study fine effects of the HPD low-fre quency oscillation modes which may be associated with the influence of the texture. (C) 2000 Elsevier Science B.V. All rights reserved.