The Electron Pairing of K$_x$Fe$_{2-y}$Se$_2$

Details The Electron Pairing of K$_x$Fe$_{2-y}$Se$_2$ The Electron Pairing of K$_x$Fe$_{2-y}$Se$_2$

2011-01-23

arxiv.org/abs/1101.4390v2

Europhy. Lett. 93, 57003 (2011)

Physics

Condensed Matter

Superconductivity

added results with leading s-wave pairing, 15 pages, 7 figures, double line spacing

Scientific paper

10.1209/0295-5075/93/57003

We studied the pairing instabilities in K$_x$Fe$_{2-y}$Se$_2$ using a two stage functional renormalization group (FRG) method. Our results suggest the leading and subleading pairing symmetries are nodeless $d_{x^2-y^2}$ and nodal extended $s$ respectively. In addition, despite having no Fermi surfaces we find the buried hole bands make important contributions to the final effective interaction. From the bandstructure, spin susceptibility and the FRG results we conclude that the low energy effective interaction in K$_x$Fe$_{2-y}$Se$_2$ is well described by a $J_1-J_2$ model with dominant nearest-neighbor antiferromagnetic interaction $J_1$ (at least as far as the superconducting pairing is concerned). In the end we briefly mention several obvious experiments to test whether the pairing symmetry is indeed $d_{x^2-y^2}$.

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