Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 150, Issue 3-4, Pages 135-144Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-007-9530-7
Keywords
Bose-Einstein condensation; magnons; superfluid He-3
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The possibility of Bose-Einstein condensation of excitations has been discussed for a long time. The phenomenon of the phase-coherent precession of magnetization in superfluid He-3 and the related effects of spin superfluidity are based on the true Bose-Einstein condensation of magnons. Several different states of coherent precession has been observed in He-3-B: homogeneously precessing domain (HPD); persistent signal formed by Q-balls at very low temperatures; coherent precession with fractional magnetization; and a mode of the coherent precession in compressed aerogel. The coherent precession has been also found in He-3-A in compressed aerogel. Here we demonstrate that all these cases are examples of a Bose-Einstein condensation of magnons, with the magnon interaction term in the Gross-Pitaevskii equation being provided by different types of spin-orbit coupling in the background of the coherent precession.
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