• 31 March 2008
Abstract
Based on experimental data on the newly synthesized iron-based superconductors and the relevant band structure calculations, we propose a minimal two-band BCS-type Hamiltonian with the interband Hubbard interaction included. We show that this two-band model is able to capture the essential features of unconventional superconductivity and antiferromagnetism in this family of materials. It is found that bound electron-hole pairs can be condensed to reveal the antiferromagnetic ordering for zero and very small doping, while the superconducting ordering with the d-wave pairing symmetry emerges at small finite doping. The derived analytical formulas not only give out a nearly symmetric phase diagram for electron and hole doping, but also is likely able to account for existing main experimental results.

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