The role of electronic Coulomb correlations in iron-based superconductors is an important open question. We provide theoretical evidence for strong correlation effects in the FeSe compound, based on dynamical mean field calculations. A lower Hubbard band is found in the spectral properties. Moreover, together with significant orbital-dependent mass enhancements, we find that the normal state is a bad metal over an extended temperature range, implying a non-Fermi liquid. Predictions for angle-resolved photoemission spectroscopy are made.
@article{arxiv.1003.1286,
title = {Theoretical evidence for strong correlations and incoherent metallic state in FeSe},
author = {Markus Aichhorn and Silke Biermann and Takashi Miyake and Antoine Georges and Masatoshi Imada},
journal= {arXiv preprint arXiv:1003.1286},
year = {2010}
}