Superflow-Stabilized Nonlinear NMR in Rotating 3He-B

Details Superflow-Stabilized Nonlinear NMR in Rotating 3He-B Superflow-Stabilized Nonlinear NMR in Rotating 3He-B

1998-05-11

arxiv.org/abs/cond-mat/9805119v2

Phys.Rev.B59:165-168,1999

Physics

Condensed Matter

Revtex file, 5 pages, 4 figures, version submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevB.59.165

Nonlinear spin precession has been observed in 3He-B in large counterflow of the normal and superfluid fractions. The new precessing state is stabilized at high rf excitation level and displays frequency-locked precession over a large range of frequency shifts, with the magnetization at its equilibrium value. Comparison to analytical and numerical calculation indicates that in this state the orbital angular momentum L of the Cooper pairs is oriented transverse to the external magnetic field in a ``non-Leggett'' configuration with broken spin-orbit coupling. The resonance shift depends on the tipping angle theta of the magnetization as omega - omega_L = (Omega_B^2 / 2 omega_L)(cos(theta) - 1/5). The phase diagram of the precessing modes with arbitrary orientation of L is constructed.

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