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The Fe vacancy and its ordering pattern is a unique property of the AxFe2−ySe2 (A = K, Rb, Cs) superconductors. Below the structural transition temperature TS ∼ 550 K, the system phase separates into the I4/mmm phase with no Fe vacancy and the I4/m phase with the 5×5×1 vacancy order. In this work, an Ising-like Hamiltonian defined on the Fe-sublattice is constructed...
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