Publication Type
Journal
Journal Name
Physical Review B
Publication Date
Page Number
245139
Volume
93
Issue
24
Abstract
We present a study of the tetragonal to collapsed-tetragonal transition of CaFe2As2 using angle-resolved
photoemission spectroscopy and dynamical mean field theory-based electronic structure calculations.We observe
that the collapsed-tetragonal phase exhibits reduced correlations and a higher coherence temperature due to the
stronger Fe-As hybridization. Furthermore, a comparison of measured photoemission spectra and theoretical
spectral functions shows that momentum-dependent corrections to the density functional band structure are
essential for the description of low-energy quasiparticle dispersions. We introduce those using the recently
proposed combined “screened exchange + dynamical mean field theory” scheme.