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The lattices and density of states (DOS) for the novel superconductor Sr1−xKxFe2As2 (x=0–1) are calculated based on the density functional theory with the scheme of the linearized augmented plane wave and the improved local orbital (APW+lo). The effects of K-doping on the lattice indicate that the K substitution induces a modification of the FeAs4 tetrahedron into the regular one gradually. DOS...
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