project title: Generation and detection of excitations in superfluid 3H-B with a quartz tuning fork oscillator
project leader: Professor Peter Skyba and Mr. Marcel Clovecko
access given (in days): 90
access used (in days): 87
local host: Professor Matti Krusius
home institution: Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
country of institution: Slovakia
starting date (yyyy-mm-dd): 2007-01-15
Vibrating wire resonators have been used with great success to study quasiparticle excitations and quantized vortices in superfluids. Quarts tuning fork oscillators at an order of magnitude higher frequencies could be expected to be equally valuable tools. The object of this study is to analyze the responses of a pair of quartz oscillators of which one functions as sensor at low drive and the other as generator at variable drive level. This study is performed at the lowest temperatures (in the ballistic regime of quasiparticle motion) in the rotating cryostat.
Marcel Clovecko has participated in measurements on the response of quartz tuning fork oscillators as a function of the amplitude of their harmonic excitation, temperature, and rotational flow in superfluid 3He-B. He has also worked on the analysis of the results. Both the measurements and the analysis have been completed, but the final interpretation and their reports are in preparation. The project and its continuation were discussed at a User's Meeting end of March, 2008. Report: Blazkova, M., Clovecko, M., Eltsov, V.B., Gazo, E., de Graaf, R., Hosio, J.J., Krusius, M., Schmoranzer, D., Schoepe, W., Skrbek, L., Skyba, P., Solntsev, R.E., and Vinen, W.F., Vibrating quartz fork - a tool for cryogenic helium, Journal of Low Temperature Physics, 150, p. 525-535 (2008).