We revisit the electronic structure of Nickel (Ni) using the density functional theory (DFT) and dynamical mean-field theory (DMFT) for the theoretical description of its electronic structure properties along with finite-temperature magnetism. Our study provides a comprehensive account of electronic and magnetic properties with the same set of Coulomb interaction parameters, U=5.78 eV and J=1.1 eV calculated using first-principles approach. The nature of theoretical magnetization curves obtained from DFT and DFT+DMFT as well as the experimental curve show deviation from the standard models of magnetism, viz Stoner and spin fluctuation model. In comparison to DFT+DMFT method, temperature dependent DFT approach is found to well describe the finite-temperature magnentization curve of Ni below critical temperature (T 631 K). The study finds significant Pauli-spin susceptibility contribution to paramagnetic spin susceptibility. Excluding the Pauli-spin response yields a linear Curie-Weiss dependence of the inverse paramagnetic susceptibility at higher temperatures. Also, the presence of mixed valence electronic configuration (3d8, 3d9 and 3d7) is noted. The competing degrees of both the itinerant and localized moment picture of 3d states are found to dictate the finite-temperature magnetization of the system. Furthermore, the quasiparticle scattering rate is found to exhibit strong deviation from T 2 behaviour in temperature leading to the breakdown of conventional Fermi-liquid theory. In addition to the 6 eV satellite, our calculated electronic excitation spectrum shows the possible presence of satellite feature extending sim0 eV binding energy, which has also been reported experimentally. Interestingly, our G0W0 results find the presence of plasmonic excitation contribution to the intensity of famous 6 eV satellite along with the electronic correlation effects, paving way for its reinterpretation.
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