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Using high-resolution angle-resolved photoemission, we observe a strongspin-dependent renormalization and lifetime broadening of the quasiparticleexcitations in the electronic band structure of Ni(111) in an energy window of$\sim$0.3 eV below the Fermi level. We derive a quantitative result for thespin-dependent lifetime broadening by comparing the scattering rates ofmajority and minority $d$ states, and further show that spin-dependent electroncorrelations are instead negligible for $sp$ states. From our analysis weexperimentally determine the effective on-site Coulomb interaction $U$ causedby Stoner-like interband transitions between majority and minority $d$ states.The present results unambiguously demonstrate the remarkable impact ofspin-dependent electron correlation effects originating from single-particleexcitations in a prototypical 3$d$ transition metal, paving the way for furtherrefinement of current many-body theoretical approaches.

Strong spin dependence of correlation effects in Ni due to Stoner excitations