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Orientation of the Angular Momentum in Superfluid 3He-A in a Stretched Aerogel

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 \(\hat{l}\) has been determined. The aerogel anisotropy introduced by uniaxial stretching tends to align \(\hat{l}\) 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.

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Acknowledgements

We are grateful for support from the National Science Foundation, Condensed Matter Physics program DMR-1103625. And we thank S.A. Sauls and D. Vollhardt for helpful comments and discussion.

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Correspondence to J. I. A. Li.

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Li, J.I.A., Zimmerman, A.M., Pollanen, J. et al. Orientation of the Angular Momentum in Superfluid 3He-A in a Stretched Aerogel. J Low Temp Phys 175, 31–36 (2014). https://doi.org/10.1007/s10909-013-0917-3

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  • DOI: https://doi.org/10.1007/s10909-013-0917-3

Keywords

  • Aerogel anisotropy
  • Axial state
  • Order parameter