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

Abstract

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).

4 pages, 3 figures, revtex, submitted to PRL

References in corpus (7)

• Elastic theory of flux lattices in presence of weak disorder
• On Larkin-Imry-Ma State of 3He-A in Aerogel
• Bose-Einstein condensation of magnons in superfluid 3He
• Magnon condensation into Q-ball in 3He-B
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Cited by in corpus (28)

• Bose-Einstein condensation of magnons in superfluid 3He
• Orbital glass and spin glass states of 3He-A in aerogel
• Twenty years of magnon Bose condensation and spin current superfluidity in 3He-B
• New Chiral Phases of Superfluid 3He Stabilized by Anisotropic Silica Aerogel
• Impurity Effects of Aerogel in Superfluid ${}^3$He
• The Superfluid Glass Phase of 3He-A
• Identification of Superfluid Phases of 3He in Uniformly Isotropic 98.2% Aerogel
• Spin superfluidity and magnon BEC
• Superfluid 3He in Aerogel
• Spin Vortex in Magnon BEC of Superfluid 3He-B
• Anisotropic phases of superfluid 3He in compressed aerogel
• Stripe order in superfluid 3He confined in narrow cylinders
• Orientation of the Angular Momentum in Superfluid 3He-A in a Stretched Aerogel
• Modification of the 3He Phase Diagram by Anisotropic Disorder
• Random field and random anisotropy O(N) spin systems with a free surface
• Superfluid ${}^3$He in globally isotropic random media
• BCS - BEC crossover and quantum hydrodynamics in p-wave superfluids with a symmetry of the A1 - phase
• Surface scattering effect and the stripe order in films of the superfluid ${}^3$He B phase
• Magnonics and Supermagnonics
• Superfluid ${}^3$He in Planar Aerogel
• Thermalization of the system "3He-aerogel" at 1.5 K
• Ultrasound attenuation and a P-B-T phase diagram of superfluid 3He in 98% aerogel
• Deformed aerogels in the superfluid 3He
• Vortex core transitions in superfluid 3He in globally anisotropic aerogels
• NMR in Superfluid A-like Phase of ${}^3$He Confined in Globally Deformed Aerogel in Tilted Magnetic Field
• Mass coupling and $Q^{-1}ofimpurity-limitednormal$^3$He in a torsion pendulum
• Superfluid Phase Stability of ${}^3$He in Axially Anisotropic Aerogel
• Local structure of ordered and disordered states of 3He-A in aerogel