Temperature Dependence of the Exchange Splitting of Fe by Spin-Resolved Photoemission Spectroscopy with Synchrotron Radiation

Abstract

Temperature-induced changes in the electronic structure of Fe(100) have been investigated by spin- and angle-resolved photoemission for temperatures between room temperature and the Curie temperature ${T}_{\mathrm{C}}$. States nearly stationary in energy (${\ensuremath{\Gamma}}_{25}^{\ensuremath{'}\ensuremath{\uparrow}}$, ${\ensuremath{\Gamma}}_{12}^{\ensuremath{\uparrow}}$) have been observed for photon energy $h\ensuremath{\nu}=60$ eV. However, from a strong increase in minority-spin intensity for $h\ensuremath{\nu}=31 \mathrm{and} 21$ eV, a downwards shift of the ${\ensuremath{\Delta}}_{5}^{\ensuremath{\downarrow}}$ band is inferred to occur upon heating towards ${T}_{\mathrm{C}}$ for large $k$ vectors.