Superflow-Stabilized Nonlinear NMR in Rotating 3He-B
Abstract
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.
Cite
@article{arxiv.cond-mat/9805119,
title = {Superflow-Stabilized Nonlinear NMR in Rotating 3He-B},
author = {V. V. Dmitriev and V. B. Eltsov and M. Krusius and J. J. Ruohio and G. E. Volovik},
journal= {arXiv preprint arXiv:cond-mat/9805119},
year = {2008}
}
Comments
Revtex file, 5 pages, 4 figures, version submitted to Phys. Rev. Lett