Research Papers in Physics and Astronomy


Date of this Version



Published by American Physical Society. Copyright 1993. Permission to use. Phys. Rev. B48 (1993) 5612–5619.


Hydrogen adsorption on Gd(0001) has been studied with angle-resolved photoemission. Hydrogen adsorption attenuates the surface state near EF 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 EF about 1 eV. The state at the greater binding energy disperses toward EF 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.

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