Properties of a diagonal two-orbital ladder model of the iron pnictide superconductors
E. Berg, S. A. Kivelson, D. J. Scalapino
DOI 10.1103/PhysRevB.81.172504 · Physical Review B
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Abstract
We study a diagonal two-orbital ladder model of the Fe-based superconductors using the density-matrix renormalization-group method. At half filling, we find a close competition between a “spin-striped” state and a noncollinear “spin-checkerboard” state, as well as significant nematic correlations. Upon finite hole or electron doping, the dominant pairing correlations are found to have A1g (S-wave) symmetry.
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