Spin-polarized photoemission studies of the exchange splitting of the Gd 5d electrons near the Curie temperature

Authors

Dongqi Li, Argonne National Laboratory, Argonne, Illinois
J. Pearson, Argonne National Laboratory, Argonne, Illinois
S.D. Bader, Argonne National Laboratory, Argonne, Illinois
D.N. McIlroy, University of Nebraska-Lincoln
C. Waldfried, University of Nebraska-Lincoln
Peter A. Dowben, University of Nebraska-LincolnFollow

Date of this Version

May 1995

Comments

Published by American Physical Society. Copyright 1995. Permission to use. Phys. Rev. B 51 (1995) 13895-13898. http://prb.aps.org/.

Abstract

Spin-polarized photoemission was employed to investigate the temperature dependence of the exchange splitting of Gd(0001) for both the surface state near the Fermi level E_F and the 5d bulk bands. The bulk bands at 1–2 eV below E _F show Stoner-like behavior where two peaks with opposite spin polarization shift toward each other as the temperature increases. In contrast, the temperature dependence of the surface state indicates spin-mixing behavior due to fluctuating local moments. These differences are attributed to the degree of itinerancy of the 5d electrons in the two cases.