Theory for superconductivity in (Tl,K)Fe$_x$Se$_2$ as a doped Mott insulator

Details Theory for superconductivity in (Tl,K)Fe$_x$Se$_2$ as a doped Mott insulator Theory for superconductivity in (Tl,K)Fe$_x$Se$_2$ as a doped Mott insulator

2011-01-24

arxiv.org/abs/1101.4462v3

EPL 95, 17003 (2011)

Physics

Condensed Matter

Superconductivity

4+ pages, 3 figures, to appear in EPL

Scientific paper

10.1209/0295-5075/95/17003

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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