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Susceptibility(T )TTcγ = 7/4 (2d)γ ≈ 1.24 (3d)numerical data from a finite system27MC of the Ising ModelSingle flip Metropolis:new configurationold configuration• Choose one site i (having spin σ i ).• Calculate ΔE = E(Y) -E(X) = 2Jσ i h i .• If ΔE < 0 then flip spin: σ i → - σ i .• If ΔE > 0 flip with probability exp(-ΔE/kT).where h i is the local field at site iapplethi nn of ij28
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