Magnon interactions strongly renormalize the spin-wave spectrum of the pyrochlore all-in-all-out antiferromagnet and can drive the lowest band to negative energies, suggesting an instability of the phase at small DMI.
Oguchi, Theory of spin-wave interactions in ferro- and antiferromagnetism, Phys
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Spin wave interactions in the pyrochlore Heisenberg antiferromagnet with Dzyaloshinskii-Moriya interactions
Magnon interactions strongly renormalize the spin-wave spectrum of the pyrochlore all-in-all-out antiferromagnet and can drive the lowest band to negative energies, suggesting an instability of the phase at small DMI.