Competitions of magnetism and superconductivity in FeAs-based materials

Details Competitions of magnetism and superconductivity in FeAs-based materials Competitions of magnetism and superconductivity in FeAs-based materials

2008-07-03

arxiv.org/abs/0807.0587v1

Chin. Phys. B 18(06), 2545 (2009)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

Using the numerical unrestricted Hartree-Fock approach, we study the ground state of a two-orbital model describing newly discovered FeAs-based superconductors. We observe the competition of a $(0, \pi)$ mode spin-density wave and the superconductivity as the doping concentration changes. There might be a small region in the electron-doping side where the magnetism and superconductivity coexist. The superconducting pairing is found to be spin singlet, orbital even, and mixed s$_{xy}$ + d$_{x^{2}-y^{2}}$ wave (even parity).

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