Competitions of magnetism and superconductivity in FeAs-based materials

• 来源期刊: 中国物理B（英文版）
• 关键词: FeAs-based superconductors magnetism Hartree-Fock approach pairing symmetry
• 年，卷（期）: 2009,（6）
• 页码范围: 2545-2550
• 页数: 6页
• 语种: 英文

摘要

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, π) 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 coexisting sxy + dx2-y2 wave (even parity).