Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 6: Electronic structure I

O 6.6: Vortrag

Montag, 23. März 2009, 12:30–12:45, SCH A216

PE and IPE study of the surface electronic structure of Y(0001) — •Sebastian D. Stolwijk¹, Michael Budke¹, Kristian M. Döbrich², and Markus Donath¹ — ¹Physikalisches Institut, Westfälische Wilhelms-Universität Münster — ²Fachbereich Physik, Freie Universität Berlin

Yttrium and gadolinium are isoelectronic elements with respect to their valence bands but differ in their magnetic properties due to the additional 4f electrons in Gd. Therefore, Y may be viewed as paramagnetic model for ferromagnetic Gd. A comparative study of the electronic structure of Y and Gd promises to reveal electronic properties that are directly linked to ferromagnetism.

For more than 20 years, differences in the photoemission spectra of Y(0001) obtained from single-crystalline bulk samples and thin films grown on W(110) have remained an unsolved puzzle. Our recent study on the (0001) surface of a single-crystalline yttrium bulk sample shows that most of the spectral features arise due to impurities such as carbon, chlorine, oxygen and hydrogen [1]. In order to develop a consistent picture of the surface electronic structure of Y(0001), we compare direct and inverse-photoemission results from single-crystalline yttrium bulk samples and ultrathin films, particularly with regard to the surface state close to the Fermi level. These results are discussed in view of data obtained for Gd.

[1] M. Budke, J. S. Correa, and M. Donath, Phys. Rev. B 77, 161401(R) (2008)