Influence of \(^4\)He Coverage on Resonance Properties of a Quartz Tuning Fork Immersed in Liquid \(^3\)He
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Nowadays quartz tuning forks are commonly used for temperature measurements in experiments with liquid (both normal and superfluid) \(^3\)He. In most of the experiments pure \(^3\)He is used, but in some cases \(^4\)He is added in order to cover surfaces by a few monolayers of \(^4\)He. We report here measurements of influence of different \(^4\)He coverages on the fork resonance properties at different pressures. We have found that the presence of even small amounts of paramagnetic \(^3\)He on the fork surface may essentially change the temperature calibration.
KeywordsQuartz tuning fork Liquid \(^3\)He \(^4\)He coverage
We are grateful to I.A. Fomin and V.I. Marchenko for useful discussions. This work was supported in part by RFBR Grant 16-02-00349, Russian Science Support Foundation, and the Basic Research Program of the Presidium of Russian Academy of Sciences.