Weak bond frustration in 2D Heisenberg ferromagnets produces logarithmically correlated spin-stiffness fluctuations whose RG flow drives stiffness to zero, giving soft magnons with scale-dependent z>2.
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Vanishing spin stiffness in weakly disordered two-dimensional Heisenberg ferromagnets
Weak bond frustration in 2D Heisenberg ferromagnets produces logarithmically correlated spin-stiffness fluctuations whose RG flow drives stiffness to zero, giving soft magnons with scale-dependent z>2.