Measurements of anisotropic mass of magnons confined in a harmonic trap in superfluid $^3$He-B
V. V. Zavjalov, S. Autti, V. B. Eltsov, P. J. Heikkinen
TL;DR
This paper reports measurements of the anisotropic magnon mass and spin-wave velocities in superfluid helium-3 B-phase using NMR spectroscopy, providing new insights into Fermi-liquid parameters.
Contribution
It introduces a method to measure anisotropic magnon mass in a harmonic trap and determines related Fermi-liquid parameters in superfluid helium-3 B.
Findings
Measured anisotropic magnon mass and spin-wave velocities
Provided values for Fermi-liquid parameter $F^a_1$
Demonstrated NMR spectroscopy as an effective tool for such measurements
Abstract
We can pump magnons to a nearly harmonic magneto-textural trap in superfluid He-B. Using the NMR spectroscopy of levels in the trap we have measured the anisotropic magnon mass and related values of the spin-wave velocities. Based on our measurements we provide values of the Fermi-liquid parameter .
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