Extended Hubbard model of superconductivity driven by charge fluctuations in iron-pnictides

Details Extended Hubbard model of superconductivity driven by charge fluctuations in iron-pnictides Extended Hubbard model of superconductivity driven by charge fluctuations in iron-pnictides

2011-06-22

arxiv.org/abs/1106.4552v2

Phys. Rev. B 84, 140505(R) (2011)

Physics

Condensed Matter

Superconductivity

revised version, to be published in Phys. Rev. B as a rapid communication. 5 pages, 4 eps figures and 1 table

Scientific paper

10.1103/PhysRevB.84.140505

We present a scenario for iron-pnictide superconductivity mediated by charge fluctuations that are strongly enhanced by Fe-As intersite electronic interactions. Deriving an eight-band extended Hubbard model including Fe 3$d$ and As 4$p$ orbitals for the LaOFeAs family, we show that charge fluctuations induced by $p$-$d$ charge transfer and As orbital polarization interactions in the Fe-pnictogen structure peak at wavevectors $(0, 0)$, and ($\pi$, 0) and ($\pi$, $\pi$) respectively. Intraorbital spin-singlet pairing attraction develops at these wavevectors and the solution of the linearized gap equation shows robust s-wave superconductivity with both $s_\pm$ and $s_{++}$ gap functions.

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