On critical behavior of phase transitions in certain antiferromagnets with complicated ordering
Andrei Mudrov, Konstantin Varnashev
Abstract
Within the four-loop expansion, we study the critical behavior of certain antiferromagnets with complicated ordering. We show that an anisotropic stable fixed point governs the phase transitions with new critical exponents. This is supported by the estimate of critical dimensionality NcC=1.445(20) obtained from six loops via the exact relation NcC=1/2 NcR established for the real and complex hypercubic models.
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