Figure 1: Calculated Fermi surfaces representative of (a) arsenides [Ba(Fe1.94Co0.06)2As2] and (b) selenides (K0.8Fe2Se2) [10]. Different shades of red denote hole Fermi surfaces, and different shades of blue the electron ones. The arrows show quasinesting vectors.Ã This simple concept has been questioned on at least two occasions when new iron-based superconducting materials were discovered. This
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