Abstract
A new superfluid phase of \(^3\)He, a polar phase, which is known to stabilize in nematic aerogel, has already led to the observation of many new phenomena. One important condition for the existence of the polar phase is a \(^4\)He coverage, which removes solid paramagnetic \(^3\)He from the surface of the aerogel strands. We report here the results of NMR experiments with superfluid \(^3\)He in nematic aerogel demonstrating the influence of \(^4\)He coverage. Simultaneous measurements of resonance properties of a quartz tuning fork immersed in liquid \(^3\)He well correlate with the NMR data.
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Acknowledgements
The experiments on Setup 1 are carried out at the Kapitza Institute (Moscow) and was supported by the Russian Science Foundation (project no. 18-12-00384). The experimental work on Setup 2 is carried out in the Low Temperature Laboratory, which is a part of the OtaNano research infrastructure of Aalto University, and was supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 694248) and by Academy of Finland (project 334470).
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Dmitriev, V.V., Eltsov, V.B., Rysti, J. et al. Polar Phase of \(^3\)He in Nematic Aerogel and Quartz Tuning Fork as Sensitive Detectors of Surface Boundary Conditions. J Low Temp Phys 208, 3–16 (2022). https://doi.org/10.1007/s10909-022-02667-2
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DOI: https://doi.org/10.1007/s10909-022-02667-2