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).
Received: 06 September 2008
Revised: 09 November 2008
Accepted manuscript online:
PACS:
74.25.Ha
(Magnetic properties including vortex structures and related phenomena)
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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