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arXiv · 2505.00313

A$_1$-A$_2$ splitting in pure $^3$He in nematic aerogel

V. V. Dmitriev·M. S. Kutuzov·D. V. Petrova·A. A. Soldatov·A. N. Yudin
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Abstract

Here, we present the results of vibrating wire experiments in pure $^3$He (without $^4$He coverage) in nematic aerogel. We investigated the dependence of splitting of the superfluid transition temperature of $^3$He in aerogel on magnetic field. In addition to our previous work, we used a wider range of magnetic fields (up to 31 kOe) and managed to detect both the "upper" and "lower" superfluid transition temperatures. The solid paramagnetic $^3$He layer on the aerogel strands activates the magnetic scattering channel. According to theory, it should result in linear splitting at high ($\ge20$ kOe) fields, while at lower fields the splitting is expected to be nonlinear. We were able to observe this nonlinearity, but we have a discrepancy with theoretical predictions regarding the range of fields where nonlinearity occurs. Possible reasons for this are discussed.

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V. V. Dmitriev, M. S. Kutuzov, D. V. Petrova, A. A. Soldatov, A. N. Yudin. 2025-05-01. A$_1$-A$_2$ splitting in pure $^3$He in nematic aerogel. https://arxiv.org/abs/2505.00313

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