Observation of a new superfluid phase for 3 He embedded in nematically ordered aerogel

N. Zhelev, M. Reichl, T. S. Abhilash, E. N. Smith, K. X. Nguyen, E. J. Mueller, J. M. Parpia

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

Abstract

In bulk superfluid 3 He at zero magnetic field, two phases emerge with the B-phase stable everywhere except at high pressures and temperatures, where the A-phase is favoured. Aerogels with nanostructure smaller than the superfluid coherence length are the only means to introduce disorder into the superfluid. Here we use a torsion pendulum to study 3 He confined in an extremely anisotropic, nematically ordered aerogel consisting of ∼410 nm-thick alumina strands, spaced by ∼100 nm, and aligned parallel to the pendulum axis. Kinks in the development of the superfluid fraction (at various pressures) as the temperature is varied correspond to phase transitions. Two such transitions are seen in the superfluid state, and we identify the superfluid phase closest to T c at low pressure as the polar state, a phase that is not seen in bulk 3 He.

Original languageEnglish
Article number12975
JournalNature Communications
Volume7
DOIs
Publication statusPublished - 27 Sep 2016
MoE publication typeA1 Journal article-refereed

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