Abstract
The long-range order realized in the superfluid phases of3He leads to a nonlocal motion of spin in these phases. In the B phase the nonlocality manifestsitself in the formation of a homogeneously precessing domain (HPD). This domain isformed under conditions of nuclear magnetic resonance. Within the domain spin precessescoherently—with the same frequency and phase even though the steady magnetic fieldcan be nonuniform. Coherence of precession is maintained by the spin currentcarried by the condensate of Cooper pairs. The key experiments, revealing themain properties of the HPD and the underlying theory are briefly reviewed inthis paper.
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