Abstract

The critical temperature, thermal and magnetic exponents, and the graphs of $\frac{d{T}_{\mathrm{eff}}}{\mathrm{dl}}$ versus ${T}_{\mathrm{eff}}$ (where ${T}_{\mathrm{eff}}$ denotes "effective" temperature of the system and $l$ the renormalization-group parameter) for the $d=3$, $n=2, 3$ models are obtained using the Migdal-Kadanoff scheme. Results of finite-lattice approximations for the $d=2$, $n=2$ model are also presented.

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