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Coexistence of the spin-density wave and superconductivity in Ba <sub>1−x</sub> K <sub>x</sub> Fe <sub>2</sub> As <sub>2</sub>
The relation between the spin-density wave (SDW) and superconducting order is a central topic in the current research on the FeAs-based high-TC superconductors. Conflicting results exist in the LaFeAs(O, F)-class of materials, for which whether the SDW and superconductivity are mutually exclusive or they can coexist has not been settled. …