Effect of Magnetic Impurities on Superfluid He 3

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


It is known that both magnetic and nonmagnetic impurities suppress unconventional superconductivity. Here we compare their effect on the paradigm unconventional superconductor, superfluid He3, using highly dilute silica aerogel. Switching magnetic to nonmagnetic scattering in the same physical system is achieved by coating the aerogel surface with He4. We find a marginal influence on the transition temperature itself. However, we have discovered that the A phase, which breaks time reversal symmetry, is strongly influenced, while the isotropic B phase is unchanged. Importantly, this occurs only if the impurities are anisotropically distributed on a global scale.

Original languageEnglish (US)
Article number025302
JournalPhysical review letters
Issue number2
StatePublished - Jan 13 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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