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 (${\Gamma }_{25}^{\prime \uparrow }$, ${\Gamma }_{12}^{\uparrow }$) have been observed for photon energy $h\nu =60\mathrm{}$ eV. However, from a strong increase in minority-spin intensity for $h\nu =31\mathrm{} \mathrm{and} 21$ eV, a downwards shift of the ${\Delta }_5^{\downarrow }$ band is inferred to occur upon heating towards $T_{\mathrm{C}}$ for large $k$ vectors.