Competitions of magnetism and superconductivity in FeAs-based materials

Abstract

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).

5 pages, 3 figures

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