Pressure-decoupled magnetic and structural transitions of the parent compound of iron-based 122 supe

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The recent discovery of iron ferropnictide superconductors has received intensive concern in connection with magnetically involved superconductors.Prominent features of ferropnictide superconductors are becoming apparent: the parent compounds exhibit an antiferromagnetic ordered spin density wave (SDW) state, the magnetic-phase transition is always accompanied by a crystal structural transition, and superconductivity can be induced by suppressing the SDW phase via either chemical doping or applied external pressure to the parent state.
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