Abstract
The phenomenon of phase-coherent precession of magnetization in superfluid 3He and the related effects of spin superfluidity are based on the true Bose-Einstein condensation of magnons. Several different states of coherent precession have been observed in 3He-B: homogeneously precessing domain (HPD); persistent signal formed by Q-balls at very low temperatures; coherent precession with fractional magnetization; and two new modes of coherent precession in compressed aerogel. Here we present evidence of magnons Bose-Einstein condensation in 3He-A in a compressed aerogel.
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Hunger, P., Bunkov, Y.M., Collin, E. et al. Evidence for Magnon BEC in Superfluid 3He-A. J Low Temp Phys 158, 129–134 (2010). https://doi.org/10.1007/s10909-009-9970-3
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DOI: https://doi.org/10.1007/s10909-009-9970-3