Temperature Dependence of the Angle-Resolved Photoemission in Itinerant-Electron Ferromagnets

Abstract

The prediction of the local band theory of itinerant-electron ferromagnetism for the temperature dependence of the single-hole Green's function is obtained. Qualitative agreement with observation is found, but the interpretation is novel. The underlying spectral function is more complex than the simple two-peaked structure heretofore assumed. Although the width of this complex shrinks with temperature, the shrinkage does not correspond to a diminution of the exchange splitting as that quantity is most conveniently defined.