Physics – Condensed Matter – Superconductivity
Scientific paper
2011-02-20
Phys. Rev. B 83, 140512(R) (2011)
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures, to be published in Phys. Rev. B (Rapid Communication)
Scientific paper
10.1103/PhysRevB.83.140512
We study the superconducting state in newly discovered high-Tc superconductor K$_x$Fe$_2$Se$_2$ based on the ten-orbital Hubbard-Holstein model without hole-pockets. When the Coulomb interaction is large, spin-fluctuation mediated d-wave state appears due to the nesting between electron-pockets. Interestingly, the symmetry of the body-centered tetragonal structure in K$_x$Fe$_2$Se$_2$ requires the existence of nodes in the d-wave gap, although fully-gapped d-wave state is realized in the case of simple tetragonal structure. In the presence of moderate electron-phonon interaction due to Fe-ion optical modes, on the other hand, orbital fluctuations give rise to the fully-gapped $s_{++}$-wave state without sign reversal. Therefore, both superconducting states are distinguishable by careful measurements of the gap structure or the impurity effect on Tc.
Kontani Hiroshi
Onari Seiichiro
Saito Tetsuro
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