Archimedean solid-like superconducting framework in phase-separated K0.8Fe1.6+xSe2 (0<=x<=0.15)

The superconducting (SC) phase in the phase-separated (PS) K0.8Fe1.6+xSe2 (0<=x<=0.15) materials is found to crystallize on Archimedean solid-like frameworks, this structural feature originate from a spinodal phase separation (SPS) at around Ts~540K depending slightly on the Fe concentration. Two stable phases in K0.8Fe1.6+xSe2 are demonstrated to be the SC K0.5Fe2Se2 and antiferromagnetic (AFM) K0.8Fe1.6Se2. The spinodal waves go along the systematic [113] direction and result in notable lamellar structure as illustrated by using the strain-field theoretical simulation. The 3-dimentional SC framework is constructed by hollow truncated octahedra similar with what discussed for Archimedean solids. Based on this structural model, we can efficiently calculate the volume fraction of SC phase in this type of PS SC materials.

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