Photoemission Studies of Ferromagnetic and Paramagnetic Nickel

Abstract

High-resolution photoemission spectra obtained from ferromagnetic nickel (295°K, $0.47T_C$) and paramagnetic nickel (678°K, $1.07T_C$) give no evidence of a change in the position of the $d$-electron peak near the high-energy cutoff of the photoelectron distribution within the experimental uncertainty of ±0.05 eV. On the other hand, a calculation of the spectra based on a band structure with an exchange splitting of 0.37 eV for ferromagnetic Ni and zero splitting for paramagnetic Ni predicted peak position changes of 0.1 to 0.2 eV.