Magnetic Distortion of the B-like Phase of Superfluid He Confined in Aerogel

We present measurements of the response of the B-like phase of superfluid He in aerogel to an applied flow. The measurements are made using a cylindrical piece of 98% silica aerogel attached to a vibrating wire resonator. The resonator is immersed in superfluid He at 16bar pressure and at low temper...

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Bibliographic Details
Published in:Journal of low temperature physics 2008-02, Vol.150 (3-4), p.445-452
Main Authors: Bradley, D I, Fisher, S N, Guenault, A M, Haley, R P, Pickett, G R, Roberts, J E, O'Sullivan, S, Tsepelin, V
Format: Article
Language:English
Online Access:Get full text
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Summary:We present measurements of the response of the B-like phase of superfluid He in aerogel to an applied flow. The measurements are made using a cylindrical piece of 98% silica aerogel attached to a vibrating wire resonator. The resonator is immersed in superfluid He at 16bar pressure and at low temperatures. A variable magnetic field is applied such that the aerogel-confined superfluid may exist in the A-like or B-like phase, while the surrounding fluid is always in the bulk B-phase. The resonator response reveals a velocity dependence of the inferred aerogel-confined superfluid fraction. We discuss measurements of the temperature and magnetic field dependence of the response in the B-like phase. We find a significant field dependence indicating a strong magnetic distortion of the B-like phase order parameter.
ISSN:0022-2291
DOI:10.1007/s10909-007-9573-9