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Introduction to Iron-Based Superconductors

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The ThCr 2 Si 2 Structure Type<br />

Stabilized by different types of<br />

bonding: ionic, M-X bonding, M-M<br />

bonding, X-X bonding, A-X --- can<br />

tune <strong>to</strong> crossovers.<br />

Interplay between magnetism and<br />

bonding in Fe compounds, e.g.<br />

collapsed phase of CaFe 2 As 2<br />

(Yildirim)

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