Improved Phase Diagrams of Ashkin-Teller Model |
| P. Pawlicki, G. Kamieniarz, P. Kozlowski Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-624 Poznań, Poland R. Dekeyser and J. Rogiers Instituut voor Theoretische Fysica, Katholieke Universiteit Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium |
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| The phase diagram of the Askhin-Teller model in two dimensions is determined. Numerical calculations are performed for the simple square L × L lattice using transfer matrix technique. Exploiting finite-size scaling all unknown critical lines were obtained with good accuracy. An extended version of the Ashkin-Teller model is also considered within the molecular field renormalization group method and the critical surface for three-parameter odd-parity Hamiltonian is calculated. |
| DOI: 10.12693/APhysPolA.92.453 PACS numbers: 64.60.Ak, 75.10.Hk, 75.40.Mg |