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VOLUME 74 (2001) | ISSUE 5 | PAGE 309
On critical behavior of phase transitions in certain antiferromagnets with complicated ordering
PACS: 64.60.-i, 75.40.Cx
Abstract
Within the four-loop \varepsilon 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 N_c^C=\frac{1}{2} N_c^R established for the real and complex hypercubic models.