Critical thermodynamics of three-dimensional MN-component field model with cubic anisotropy from higher-loop εexpansion

Details Critical thermodynamics of three-dimensional MN-component field model with cubic anisotropy from higher-loop εexpansion Critical thermodynamics of three-dimensional MN-component field model with cubic anisotropy from higher-loop εexpansion

2001-08-19

arxiv.org/abs/cond-mat/0108298v1

J.Phys. A34 (2001) L347-L353

Physics

Condensed Matter

Statistical Mechanics

9 pages, LaTeX, no figures. Published version

Scientific paper

10.1088/0305-4470/34/23/102

The critical thermodynamics of an $MN$-component field model with cubic anisotropy relevant to the phase transitions in certain crystals with complicated ordering is studied within the four-loop $\ve$ expansion using the minimal subtraction scheme. Investigation of the global structure of RG flows for the physically significant cases M=2, N=2 and M=2, N=3 shows that the model has an anisotropic stable fixed point with new critical exponents. The critical dimensionality of the order parameter is proved to be equal to $N_c^C=1.445(20)$, that is exactly half its counterpart in the real hypercubic model.

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