NMR Frequency Shifts and Phase Identification in Superfluid 3 He

A. M. Zimmerman*, M. D. Nguyen, W. P. Halperin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The pressure dependence of the order parameter in superfluid 3 He is amazingly simple. In the Ginzburg–Landau regime, i.e., close to T c , the square of the order parameter can be accurately measured by its proportionality to NMR frequency shifts and is strictly linear in pressure. This behavior is replicated for superfluid 3 He imbibed in isotropic and anisotropic silica aerogels. The proportionality factor is constrained by the symmetry of the superfluid state and is an important signature of the corresponding superfluid phase. For the purpose of identifying various new superfluid states in the p-wave manifold, the order parameter amplitude of superfluid 3 He -A is a useful reference, and this simple pressure dependence greatly facilitates identification.

Original languageEnglish (US)
Pages (from-to)358-364
Number of pages7
JournalJournal of Low Temperature Physics
Issue number3-4
StatePublished - May 15 2019


  • Aerogel
  • NMR
  • Phase diagram
  • Superfluid He

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Condensed Matter Physics


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