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Probing Andreev reflection in superfluid He-3-B using a quartz tuning fork.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>09/2008
<mark>Journal</mark>Journal of Low Temperature Physics
Issue number5-6
Number of pages9
Pages (from-to)147-155
Publication StatusPublished
<mark>Original language</mark>English


Direct measurements of the Andreev reflection of the quasiparticles excitations in superfluid He-3-B in the ballistic regime at 0.5 bar using a quartz tuning fork are presented. Based on these measurements, we were able to determine the value of the ratio Delta(0)/kT(c) to be 1.71, in reasonable agreement with previous measurements. Moreover, it seems that Andreev reflection of excitations gives a possibility to determine the value of the constant lambda characterizing the velocity field profile. This value for a tuning fork was estimated to be 1.28, different from that for cylindrical wire (lambda similar to 0.95), suggesting that the anti-phase oscillatory motion and the geometry of the tuning prongs lead to an enhancement of the velocity of the superfluid flow.