Bradley, Ian and Clovecko, M. and Gazo, E. and Skyba, P. (2008) Probing Andreev reflection in superfluid He-3-B using a quartz tuning fork. Journal of Low Temperature Physics, 152 (5-6). pp. 147-155. ISSN 0022-2291
Full text not available from this repository.Abstract
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.