α-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 α-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.
@article{arxiv.0910.3828,
title = {$\alpha$-FeSe as an orbital-selective incoherent metal: An LDA+DMFT study},
author = {L. Craco and M. S. Laad and S. Leoni},
journal= {arXiv preprint arXiv:0910.3828},
year = {2009}
}