Tetragonal and collapsed-tetragonal phases of CaFe2As2: A view from angle-resolved photoemission and dynamical mean-field theory

Ambroise Van Roekeghem, Pierre Richard, Xun Shi, Shangfei Wu, Lingkun Zeng, Bayrammurad Saparov, Yoshiyuki Ohtsubo, Tian Qian, Athena S. Sefat, Silke Biermann, Hong Ding

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摘要

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.

源语言英语
文章编号245139
期刊Physical Review B
93
24
DOI
出版状态已出版 - 20 6月 2016
已对外发布

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