Critical surface of the ising model with first-neighbor,second-neighbor,and four-spin interactions |
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Authors: | Theodore W Burkhardt |
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Institution: | (1) Institut Laue-Langevin, BP 156 Centre de Tri, F-38042 Grenoble Cedex, France |
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Abstract: | Exact values are obtained for the slopesK
1
c
(0, 0)/K
2,K
1
c
(0, 0)/K
4 of the critical surface of paramagnetic-ferromagnetic transitionsK
1
c
(K
2,K
4) for the two-dimensional Ising model on a square lattice with first-neighbor, second-neighbor, and four-spin couplingsK
1,K
2, andK
4, respectively. The results are obtained using universality arguments to relate the slopes to known spin-spin correlation functions forK
2=K
4=0. The equivalence of different expressions for the slopes in terms of correlation functions yields sum rules for the divergent part of certain sums over the second-neighbor and four-spin energy-energy correlation functions. |
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Keywords: | |
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