Jiangping Hu, Ningning Hao
Although iron-based superconductors are multi-orbital systems with complicated band structures, we demonstrate that the low energy physics which is responsible for high-$T_c$ superconductivity is essentially governed by two weakly coupled single-band effective Hamiltonians near half filling. This low energy physics becomes explicit after performing a gauge mapping which maps a s-wave pairing to a d-wave pairing in the view of the sublattice of the iron square lattice. Each of the two bands results in a robust $A_{1g}$ s-wave pairing which can be exactly mapped to the d-wave pairing observed in cuprates, the high $T_c$ Cu-oxide superconductors. Our derivation provides an unified understanding of iron-pnictides and iron-chalcogenides, and suggests that cuprates and iron-based superconductors share identical high-$T_c$ superconducting mechanism.
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http://arxiv.org/abs/1202.5881
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