Altering the Gd(0001) surface electronic structure with hydrogen adsorption

Authors

Dongqi Li, Syracuse University
Jiandi Zhang, University of Nebraska-LincolnFollow
Peter A. Dowben, University of Nebraska-LincolnFollow
M. Onellion, University of Wisconsin, Madison

Date of this Version

8-15-1993

Comments

Published by American Physical Society. Copyright 1993. Permission to use. Phys. Rev. B48 (1993) 5612–5619. http://prb.aps.org/.

Abstract

Hydrogen adsorption on Gd(0001) has been studied with angle-resolved photoemission. Hydrogen adsorption attenuates the surface state near E_F on the clean Gd(0001) surfaces and induces two two-dimensional bands which are at 3.8 eV and about 6 eV near Γ¯. The state with the smaller binding energy has dz2 character at Γ¯ and disperses away from E_F about 1 eV. The state at the greater binding energy disperses toward E_F about 0.5–1 eV. At low substrate temperatures (120–130 K), the hydrogen chemisorption on the Gd(0001) surface results in a work-function decrease of 0.2 eV. The correlation between the changes of the surface electronic structure and the corresponding change in the surface magnetic ordering is discussed.