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Spin Transport in Very Dilute 3He-4He at Very High B/T

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Abstract

We report preliminary results for pulsed-NMR measurements on a very dilute 3 He-4 He mixture (x 3 =900 ppm) in a 14.74 T field at temperatures down to 3 mK. The aim of the project is to investigate low temperature transverse spin relaxation and possible spin diffusion anisotropy. Spin-echo and T1-type measurements were employed to measure the transverse and longitudinal spin diffusion coefficients. At high temperatures both spin diffusion coefficients are well explained assuming a quasiparticle interaction consistent with previous experiments. Conversely, at low temperatures the measured value of |λωτ⊥| is apparently limited to about ten by a poorly-understood process that accelerates spin-echo decay. This hampers an accurate determination of the transverse diffusion coefficient at the lowest temperatures reached.

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Authors and Affiliations

  1. Microkelvin Laboratory, NHMFL and Physics Department, University of Florida, Gainesville, FL, 32611, USA

    H. Akimoto, J. S. Xia, E. D. Adams & N. S. Sullivan

  2. Hasbrouck Laboratory, Department of Physics, University of Massachusetts, Amherst, MA, 01003, USA

    H. Akimoto, D. Candela & W. J. Mullin

Authors
  1. H. Akimoto
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  2. J. S. Xia
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  3. E. D. Adams
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  4. D. Candela
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  5. W. J. Mullin
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  6. N. S. Sullivan
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Akimoto, H., Xia, J.S., Adams, E.D. et al. Spin Transport in Very Dilute 3He-4He at Very High B/T. Journal of Low Temperature Physics 126, 109–114 (2002). https://doi.org/10.1023/A:1013775002939

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  • DOI: https://doi.org/10.1023/A:1013775002939

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