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overview

year 2011
author(s) M. Clovecko, E. Gazo, M. Kupka, M. Skyba, P. Skyba
title High quality tuning forks in Superfluid 3He-B below 200 uK
document type Paper
source J. Low Temp . Phys. 162, 669-677 (2011)
doi 10.1007/s10909-010-0330-0
EMP/Horizon2020 This publication does not include a EMP/Horizon2020 acknowledgement.
abstract

We have investigated the influence of the damping force acting on high quality tuning forks (Q∼106) of different sizes and geometries in superfluid 3He-B at temperatures below 200 μK and a pressure of 0.1 bar. The measurements show that at low velocities, the damping of the largest fork expressed in terms of its resonance characteristic width Δf 2 rises up as its velocity increases. This is in contradiction to the damping of the fork due to Andreev reflection and it may be caused by the interaction of this fork with excitations trapped in the Andreev bond states. We present our preliminary experimental results.