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Thirty-Minute Coherence in Free Induction Decay Signals in Superfluid 3He-B

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Abstract

The persistent induction signal (PIS) is an extremely long lived NMR mode in the B-phase of superfluid 3He. The first signals observed lived for up to 25s following a moderate NMR tipping pulse, but were found to be highly irreproducible. Here we present new measurements obtained in a smooth sapphire cell designed to achieve the lowest possible temperatures. The signals observed in this cell are quite reproducible but are only excited over a restricted range of magnetic field gradients. The free induction signals exceed 30 minutes at the lowest temperatures.

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Authors and Affiliations

  1. Department of Physics, Lancaster University, Lancaster, LA1 4YB, U.K

    S. N. Fisher, A. M. Guénault, A. J. Hale, G. R. Pickett, P. A. Reeves & G. Tvalashvili

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  1. S. N. Fisher
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  2. A. M. Guénault
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  3. A. J. Hale
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  4. G. R. Pickett
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  5. P. A. Reeves
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  6. G. Tvalashvili
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Fisher, S.N., Guénault, A.M., Hale, A.J. et al. Thirty-Minute Coherence in Free Induction Decay Signals in Superfluid 3He-B. Journal of Low Temperature Physics 121, 303–308 (2000). https://doi.org/10.1023/A:1017520806966

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  • DOI: https://doi.org/10.1023/A:1017520806966

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