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Thirty-minute coherence in free induction decay signals in superfluid He-3-B.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>12/2000
<mark>Journal</mark>Journal of Low Temperature Physics
Issue number5-6
Number of pages6
Pages (from-to)303-308
Publication StatusPublished
<mark>Original language</mark>English


The persistent induction signal (PIS) is an extremely long lived NMR mode in, the B-phase of superfluid He-3. The first signals observed lived for zip 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.