Chiral transitions in three-dimensional magnets and higher order ε-expansion
S. A. Antonenko, A. I. Sokolov, K. B. Varnashev
Abstract
The critical behaviour of helimagnets and stacked triangular antiferromagnets is analyzed in (4 - ε) dimensions within three-loop approximation. Numerical estimates for marginal values of the order parameter dimensionality N obtained by resummation of corresponding ε-expansions rule out the possibility of continuous chiral transitions in magnets with Heisenberg or planar spins.
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