Hole doping and electronic correlations in Cr-substituted BaFe$_{2}$As$_{2}$

• DOI: 10.48550/arxiv.2312.09014
• Publication Date: 2023-01-01
• Authors: Marli R. Cantarino; K. R. Pakuszewski; Björn Salzmann; Pedro H. A. Moya; Wagner R. da Silv...; G. S. Freitas; P. G. Pagliuso; C. Adriano; W. H. Brito; F. A. Garcia
• Keywords: Superconductivity (cond-mat.supr-con); Condensed Matter - Strongly Correlated Electrons; Strongly Correlated Electrons (cond-mat.str-el); Physics; QC1-999; Condensed Matter - Superconductivity; FOS: Physical sciences

The absence of superconductivity (SC) in Cr-substituted BaFe$_{2}$As$_{2}$ (CrBFA) is a well-established but poorly understood topic. It also established that the suppression spin density wave transition temperature ($T_{\text{SDW}}$) CrBFA and Mn-substituted (MnBFA) almost coincides as function Cr/Mn concentrations, irrespective putative distinct electronic effects these substitutions. In this work, we employ angle-resolved photoemission spectroscopy (ARPES) combined functional theory plus dynamical mean field calculations (DFT+DMFT) to address evolution Fermi surface (FS) correlations CrBFA. Our findings reveal incorporating Cr leads an effective hole doping structure way can be well described within virtual crystal approximation (VCA). Moreover, our results show orbital-specific correlation support Hund localization scenario for phase diagram. We found fractional scaling imaginary part self-energy binding energy, which signature property Hund's metals. conclude correlated electron system changes FS are not related $T_{\text{SDW}}$. Rather, SC primarily due competition between local moments Fe-derived itinerant fluctuations.