Electronic structure of CeIr3 superconductor: DMFT studies

Abstract

We present the band structure of CeIr$_3$ superconductor calculated within the dynamical mean field theory (DMFT). Standard GGA and GGA+U methods fail to reproduce the experimental electronic specific heat coefficient $\gamma_{\rm expt.}$ due to the underestimated density of states at the Fermi level $N(E_F)$ followed by an overestimated strength of electron-phonon coupling (EPC) calculated as a renormalization of $\gamma_{\rm expt.}$. The DMFT study shows a strong hybridization of $4f$ states of Ce with $5d$-states of Ir, which leads to the larger $N(E_F)$ giving the correct $\gamma_{\rm expt.}$ with a moderate EPC in agreement with the experimental data.