Competitions of magnetism and superconductivity in FeAs-based materials

Yang Shuo, You Wen-Long, Gu Shi-Jian, Lin Hai-Qing
2009 Chinese Physics B  
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$_{xy}$ +
more » ... s$_{xy}$ + d$_{x^{2}-y^{2}}$ wave (even parity).
doi:10.1088/1674-1056/18/6/071 fatcat:bypbti3zzfevjhko6oxtsglnha