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Macroscopic Quantum System, Highly Correlated Electron State, and High Temperature Superconductivity in Iron Pnictides

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Figure

Figure 2. Schematic representation of Fe2+ dis-placement from the ideal tetrahedron centre (the dotted line shows the centre level) in two neigh-boring FeAs4 tetrahedra and formation of 1e and 2e bonds (dashed and solid lines, respectively)
Figure 5. Projections (on the XY plane) of two 2D electron crystals of electron pairs forming 2e bonds (a) and two 2D electron crystals of unpaired electrons forming 1e bonds (b) in both parts of the FeAs layer together with the projections of two Fe2+plan
Figure 7. Mutual arrangement of electron states of the new unshared pairs and Fe2+ unoccupied states and their alternation along the chain of covalently bonded ions, and also the posi-tion of the unshared pair (double arrow) with respect to the electron pa
Figure 9. Projections (on the XY plane) of 2D Wigner crystal of bo-sons (prior to the united crystal formation) in one half of the FeAs layer (a) and of the united 2D Wigner crystal of bosons (b) together with projections of two planes of Fe2+ ions shown b

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