Fisher, Shaun N. and Guénault, A.M. and Hale, A. J. and Pickett, George R. and Reeves, P. A. and Tvalashvili, G. (2000) Thirty-minute coherence in free induction decay signals in superfluid He-3-B. Journal of Low Temperature Physics, 121 (5-6). pp. 303-308. ISSN 0022-2291
Full text not available from this repository.Abstract
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.