Valence Band XPS-Study of Fe(100) at Finite Temperatures. Revision

摘要

Measuring the valence band density of states (DOS) of Fe provides a stringent test of models of metallic ferromagnetism at finite temperatures. The density of states of Fe above the Curie temperature T/sub c/, as obtained by self-consistent calculations in the disordered local moment (DLM) picture by Oguchi et al., and by Pindor et al., differs strongly from the T=0 DOS calculated by Moruzzi et al., between the Fermi energy and 2 eV binding energy, i.e., the relatively broad peak in the T=0 DOS around 1 eV binding energy is of much smaller amplitude in the T > T/sub c/ DOS. This effect should be observable by valence band XPS on Fe as a 30% decrease of intensity at about 1 eV binding energy with a typical energy resolution of about 0.8 eV. The authors have measured the valence band XPS of Fe(100) at room temperature and temperatures above T/sub c/. The predicted intensity decrease has not been observed. (ERA citation 10:046760)