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VOLUME 83 | ISSUE 12 | PAGE 624
Solution of the problem of catastrophic relaxation of homogeneous spin precession in superfluid 3He-B
Yu. M. Bunkov, V. S. L'vov+* 1), G. E. Volovik^{*\nabla 1)}
Centre de Recherches sur les Très Basses Températures, CNRS, BP166, 38042 Grenoble, France
+ Department of Chemical Physics, The Weizmann Institute of Science, 76100 Rehovot, Israel
*Low Temperature Laboratory, Helsinki University of Technology, P.O.Box 2200, FIN-02015, HUT, Finland
^{\nabla}Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia

PACS: 67.57.Lm, 76.50.+g
The quantitative analysis of the «catastrophic relaxation" of the coherent spin precession in 3He-B is presented. This phenomenon has been observed below the temperature about 0.5 Tc as an abrupt shortening of the induction signal decay. It is explained in terms of the decay instability of homogeneous transverse NMR mode into spin waves of the longitudinal NMR. Recently the cross interaction amplitude between the two modes has been calculated by Sourovtsev and Fomin [12bun-SF] for the so-called Brinkman-Smith configuration, i.e. for the orientation of the orbital momentum of Cooper pairs along the magnetic field, {\bf L}\parallel{\bf H}. In their treatment, the interaction is caused by the anisotropy of the speed of the spin waves. We found that in the more general case of the non-parallel orientation of L corresponding to the typical conditions of experiment, the spin-orbital interaction provides the additional interaction between the modes. By analyzing experimental data we are able to distinguish which contribution is dominating in different regimes.

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