The A-B transition in superfluid helium-3 under confinement in a thin slab geometry. / Zhelev, Nikolay; Abhilash, T.S. ; Smith, E.N.; Bennett, Robert; Rojas, Xavier; Levitin, Lev; Saunders, John; Parpia, Jeevak.

In: Nature Communications, Vol. 8, 15963, 03.07.2017, p. 1-9.

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Abstract

The influence of confinement on the phases of superfluid helium-3 is studied using the torsional pendulum method. We focus on the transition between the A and B phases, where the A phase is stabilized by confinement and a spatially modulated stripe phase is predicted at the A–B phase boundary. Here we discuss results from superfluid helium-3 contained in a single 1.08-μm-thick nanofluidic cavity incorporated into a high-precision torsion pendulum, and map the phase diagram between 0.1 and 5.6 bar. We observe only small supercooling of the A phase, in comparison to bulk or when confined in aerogel, with evidence for a non-monotonic pressure dependence. This suggests that an intrinsic B-phase nucleation mechanism operates under confinement. Both the phase diagram and the relative superfluid fraction of the A and B phases, show that strong coupling is present at all pressures, with implications for the stability of the stripe phase.
Original languageEnglish
Article number15963
Pages (from-to)1-9
Number of pages9
JournalNature Communications
Volume8
DOIs
Publication statusPublished - 3 Jul 2017
This open access research output is licenced under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

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