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Critical behavior of certain antiferromagnets with complicated ordering: Four-loop<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ɛ</mml:mi></mml:math>-expansion analysis
The critical behavior of a complex N-component order parameter Ginzburg-Landau model with isotropic and cubic interactions describing antiferromagnetic and structural phase transitions in certain crystals with complicated ordering is studied in the framework of the four-loop renormalization group (RG) approach in $4\ensuremath{-}\ensuremath{\varepsilon}$ dimensions. By using dimensional regularization and the minimal …