Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 28: Surface Magnetism
MA 28.14: Vortrag
Donnerstag, 29. März 2007, 18:30–18:45, H23
Exchange-split surface state on Gd(0001) revisited — •Michael Budke, Juliet Correa, and Markus Donath — Physikalisches Institut, Wilhelm-Klemm-Str. 10, 48149 Münster
The behavior of the spin-split surface state on Gd(0001) close to the Curie temperature TC has been controversially discussed: spin-resolved inverse photoemission (SR-IPE) has identified an empty minority state and a partially empty majority state [1]. While the majority state shifts to higher energies upon approaching TC the minority state shifts to lower energies and seems to become partially occupied. This Stoner-like behavior is in contradiction to early results from spin-resolved photoemission (SR-PE), where the surface state shows up at 0.2 eV binding energy, exhibiting spin-mixing behavior upon approaching TC [2]. In the last years a mixture of these two behaviors is becoming more and more accepted [3]. However, SR-PE does not see a peak crossing the Fermi energy EF as seen before in IPE. To solve this discrepancy we performed SR-PE and -IPE measurements on a 30 ML Gd film grown on Y(0001). To exclude preparation-dependent effects, the measurements were performed in the same chamber on the same sample preparation. While the spectral features in PE do not strongly depend on the film preparation, the IPE spectral features show a significant dependence on the film quality. We present temperature-dependent measurements of a well-defined film to contribute to the understanding of the magnetism of the Gd(0001) surface. [1] Donath et al. Phys. Rev Lett. 77, 5138 (1996) [2] Li et al. Phys. Rev. B 51, 13895 (1995) [3] Fedorov et al. Phys. Rev. B 65, 212409