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- W2808030664 abstract "We propose a new approach which permits us to obtain exact results for the mixed spin-1/2 and Spin-S (S > 1/2) Ising models with single ion anisotropy Δ on the square lattice. We drive an explicit expression for the critical temperature for arbitrary values of S. We determine the exact phase diagrams for different values of S, and we show that there is no tricritical point. For S integer, there is no long range order when the anisotropy exceeds a critical value which is independent of S. Furthermore, the exact Ising transition temperature TC is always recovered, for any values of S, in the limit of Δ → −∞. These exact results are based on a conjecture which extend the analyticity of the n-spin-1/2 correlations functions (except at T = TC(Ising)) for any finite number n, to n → ∞. This is confirmed by our calculations since our results are practically similar to those obtained by Monte Carlo simulations for S = 1, 2 and 3/2." @default.
- W2808030664 created "2018-06-21" @default.
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- W2808030664 date "2018-06-21" @default.
- W2808030664 modified "2023-10-16" @default.
- W2808030664 title "Exact phase diagram for the mixed spin-1/2 and spin-S Ising models on the square lattice" @default.
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- W2808030664 doi "https://doi.org/10.1088/2399-6528/aacbbe" @default.
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