$α$-FeSe as an orbital-selective incoherent metal: An LDA+DMFT study

Details $α$-FeSe as an orbital-selective incoherent metal: An LDA+DMFT study $α$-FeSe as an orbital-selective incoherent metal: An LDA+DMFT study

2009-10-20

arxiv.org/abs/0910.3828v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, submitted to PRB

Scientific paper

$\alpha$-FeSe, a prototype iron-chalcogenide superconductor, shows clear signatures of a strange incoherent normal state. Motivated thereby, we use LDA+DMFT to show how strong multi-band correlations generate a low-energy pseudogap in the normal state, giving an incoherent metal in very good semi-quantitative agreement with observations. We interpret our results in terms of $\alpha$-FeSe being close to Mottness. A wide range of anomalous responses in the "normal" state are consistently explained, lending strong support for this view. Implications for superconductivity arising from such an anomalous state are touched upon.

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