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Theory for superconductivity in (Tl,K)Fe_xSe₂ as a doped Mott insulator

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arxiv 1101.4462 v3 pith:TADEICX7 submitted 2011-01-24 cond-mat.supr-con cond-mat.str-el

Theory for superconductivity in (Tl,K)Fe_xSe₂ as a doped Mott insulator

Yi Zhou , Dong-Hui Xu , Fu-Chun Zhang , Wei-Qiang Chen This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords couplingdopedmottsuperconductivityelectronfavorablehundinsulator
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Possible superconductivity in recently discovered (Tl,K)Fe$_x$Se$_2$ compounds is studied from the viewpoint of doped Mott insulator. The Mott insulating phase is examined to be preferred in the parent compound at $x=1.5$ due to the presence of Fe vacancies. Partial filling of vacancies at the Fe-sites introduces electron carriers and leads to electron doped superconductivity. By using a two-orbital Hubbard model in the strong coupling limit, we find that the s-wave pairing is more favorable at small Hund's coupling, and d$_{x^2-y^2}$ wave pairing is more favorable at large Hund's coupling.

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