Abstract
It is shown that the conventional spin fluctuation (SF) theory of weak itinerant magnets does not take into account the effects of strong spin anharmonicity caused by large zero-point SF amplitudes and, therefore, may break down in anharmonic magnets. A microscopic approach based on a quasiparticle Fermi liquid description of strongly anharmonic weak itinerant magnets is presented generalizing the conventional theory to account for both thermal and zero-point SF.
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