Orientation of the angular momentum in superfluid 3He-A in a stretched aerogel

J. I.A. Li*, A. M. Zimmerman, J. Pollanen, C. A. Collett, W. J. Gannon, W. P. Halperin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Superfluid 3He-A in a fully characterized stretched aerogel, used in previous work by Pollanen et al., has been studied for parallel and perpendicular orientations of the magnetic field relative to the anisotropy axis of the aerogel. Consistently, we find that an equal spin pairing state (ESP) is stabilized down to the lowest temperature. From our pulsed NMR frequency shifts as a function of temperature and tip angle, the orientation of the orbital angular momentum l̂ has been determined. The aerogel anisotropy introduced by uniaxial stretching tends to align l̂ in the axial state parallel to the strain axis, consistent with the theory proposed by Sauls and contrary to Volovik's prediction based on an impurity calculation of Rainer and Vuorio.

Original languageEnglish (US)
Pages (from-to)31-36
Number of pages6
JournalJournal of Low Temperature Physics
Volume175
Issue number1-2
DOIs
StatePublished - Apr 2014

Keywords

  • Aerogel anisotropy
  • Axial state
  • Order parameter

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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