中国物理B ›› 2009, Vol. 18 ›› Issue (6): 2545-2550.doi: 10.1088/1674-1056/18/6/071

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Competitions of magnetism and superconductivity in FeAs-based materials

尤文龙1, 顾世建1, 林海青1, 杨硕2   

  1. (1)Department of Physics and ITP, The Chinese University of Hong Kong, Hong Kong, China; (2)Department of Physics and ITP, The Chinese University of Hong Kong, Hong Kong, China;Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2008-09-06 修回日期:2008-11-09 出版日期:2009-06-20 发布日期:2009-06-20
  • 基金资助:
    Project supported by the Earmarked Grant for Research from the Research Grants Council of HKSAR, China (Grant Nos CUHK 402205 and HKU3/05C).

Competitions of magnetism and superconductivity in FeAs-based materials

Yang Shuo(杨硕)a)b), You Wen-Long(尤文龙)a), Gu Shi-Jian(顾世建)a), and Lin Hai-Qing(林海青)a)†   

  1. a Department of Physics and ITP, The Chinese University of Hong Kong, Hong Kong, China; b Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2008-09-06 Revised:2008-11-09 Online:2009-06-20 Published:2009-06-20
  • Supported by:
    Project supported by the Earmarked Grant for Research from the Research Grants Council of HKSAR, China (Grant Nos CUHK 402205 and HKU3/05C).

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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).

关键词: FeAs-based superconductors, magnetism, Hartree--Fock approach, pairing symmetry

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

Key words: FeAs-based superconductors, magnetism, Hartree--Fock approach, pairing symmetry

中图分类号:  (Magnetic properties including vortex structures and related phenomena)

  • 74.25.Ha
74.20.Rp (Pairing symmetries (other than s-wave)) 74.62.Dh (Effects of crystal defects, doping and substitution) 74.70.Dd (Ternary, quaternary, and multinary compounds) 75.30.Fv (Spin-density waves)