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Chin. Phys. B, 2009, Vol. 18(6): 2545-2550    DOI: 10.1088/1674-1056/18/6/071
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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)†
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
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).
Keywords:  FeAs-based superconductors      magnetism      Hartree--Fock approach      pairing symmetry  
Received:  06 September 2008      Revised:  09 November 2008      Accepted manuscript online: 
PACS:  74.25.Ha (Magnetic properties including vortex structures and related phenomena)  
  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)  
Fund: Project supported by the Earmarked Grant for Research from the Research Grants Council of HKSAR, China (Grant Nos CUHK 402205 and HKU3/05C).

Cite this article: 

Yang Shuo(杨硕), You Wen-Long(尤文龙), Gu Shi-Jian(顾世建), and Lin Hai-Qing(林海青) Competitions of magnetism and superconductivity in FeAs-based materials 2009 Chin. Phys. B 18 2545

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