Physics – Condensed Matter – Superconductivity
Scientific paper
2009-04-25
Phys. Rev. B 79, 174530 (2009)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevB.79.174530
The electronic structures of Ba(Fe,Ru)$_2$As$_2$ and Sr(Fe,Ir)$_2$As$_2$ are investigated using density functional calculations. We find that these systems behave as coherent alloys from the electronic structure point of view. In particular, the isoelectronic substitution of Fe by Ru does not provide doping, but rather suppresses the spin density wave characteristic of the pure Fe compound by a reduction in the Stoner enhancement and an increase in the band width due hybridization involving Ru. The electronic structure near the Fermi level otherwise remains quite similar to that of BaFe$_{2}$As$_{2}$. The behavior of the Ir alloy is similar, except that in this case there is additional electron doping.
Singh David J.
Zhang Lijun
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