Quartic spin oscillations in spiral magnets generate a thermally induced spin-wave gap that scales as √T in the thermodynamic limit, with a finite-size T^{1/4} regime that vanishes as system size grows.
W ¨olfle, Quasiparticles in condensed matter systems, Reports on Progress in Physics 81, 032501 (2018)
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Anharmonic Collective Oscillations in Isotropic Spin Systems and their Spectroscopic Signatures
Quartic spin oscillations in spiral magnets generate a thermally induced spin-wave gap that scales as √T in the thermodynamic limit, with a finite-size T^{1/4} regime that vanishes as system size grows.