Strong orientational effect of stretched aerogel on the 3He order parameter

Details Strong orientational effect of stretched aerogel on the 3He order parameter Strong orientational effect of stretched aerogel on the 3He order parameter

2007-07-24

arxiv.org/abs/0707.3544v3

Phys. Rev. Lett. 100, 215304 (2008)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures, revtex, submitted to PRL

Scientific paper

10.1103/PhysRevLett.100.215304

Deformation of aerogel strongly modifies the orientation of the order parameter of superfluid 3He confined in aerogel. We used a radial squeezing of aerogel to keep the orbital angular momentum of the 3He Cooper pairs in the plane perpendicular to the magnetic field. We did not find strong evidence for a "polar" phase, with a nodal line along the equator of the Fermi surface, predicted to occur at large radial squeezing. Instead we observed 3He-A with a clear experimental evidence of the destruction of the long-range order by random anisotropy -- the Larkin-Imry-Ma effect. In 3He-B we observed and identified new modes of NMR, which are impossible to obtain in bulk 3He-B. One of these modes is characterized by a repulsive interaction between magnons, which is suitable for the magnon Bose-Einstein condensation (BEC).

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