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

doi:10.1007/s10909-013-0917-3

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

Physics And Astronomy

Research output: Contribution to journal › Article › peer-review

9 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 language	English
Pages (from-to)	31-36
Number of pages	6
Journal	Journal of Low Temperature Physics
Volume	175
Issue number	1-2
DOIs	https://doi.org/10.1007/s10909-013-0917-3
State	Published - Apr 2014

Bibliographical note

Funding Information:
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.

Keywords

Aerogel anisotropy
Axial state
Order parameter

ASJC Scopus subject areas

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

Access to Document

10.1007/s10909-013-0917-3

Cite this

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title = "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 {\^l} has been determined. The aerogel anisotropy introduced by uniaxial stretching tends to align {\^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.",

keywords = "Aerogel anisotropy, Axial state, Order parameter",

author = "Li, {J. I.A.} and Zimmerman, {A. M.} and J. Pollanen and Collett, {C. A.} and Gannon, {W. J.} and Halperin, {W. P.}",

note = "Funding Information: 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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T1 - Orientation of the angular momentum in superfluid 3He-A in a stretched aerogel

AU - Li, J. I.A.

AU - Zimmerman, A. M.

AU - Pollanen, J.

AU - Collett, C. A.

AU - Gannon, W. J.

AU - Halperin, W. P.

N1 - Funding Information: 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.

PY - 2014/4

Y1 - 2014/4

N2 - 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.

AB - 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.

KW - Aerogel anisotropy

KW - Axial state

KW - Order parameter

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