Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Surface and Interface Magnetism I (jointly with O)

MA 19.11: Vortrag

Dienstag, 12. März 2013, 13:00–13:15, H33

Epitactical grown Kondo lattices spanning different localization regimes of the Ce 4f electrons — •Holger Schwab, Mattia Mulazzi, and Friedrich Reinert — Physikalisches Institut, Experimentelle Physik VII, Universität Würzburg, D-97074 Würzburg, Germany

Ce surface alloys promise to be the choice of materials to study transformations of the electronic band structure during low temperature phase transitions in Kondo lattices. [1] The low temperature behaviour of Ce based Kondo systems strongly depends on the energy scales in the Ce atom and the hybridization between the Ce 4f orbitals and the conduction band. [2] Probing the Ce 4f spectral function [3] or the Ce 3d states therefore allows to preliminarily characterize and select such compounds. With XPS (X-ray Photoelectron Spectroscopy) of the Ce 3d states we investigated Ce surface alloys on Ag(111), Pt(111) and Pd(111) surfaces. Based on a GS-fit [4] to these data we were able to compare and rank the parameters responsible for the behaviour of these alloys in the single impurity regime of the Kondo lattice.

[1] M. Klein et al.,Phys. Rev. Lett. 106, 186407 (2011), P. Coleman, Science 327, 969 (2010)

[2] F. Patthey et al., Phys. Rev. B 42, 8864 (1990)

[3] H. Schwab et al., Phys. Rev. B 85, 125130 (2012)

[4] O. Gunnarsson et al., Phys. Rev. B 28, 4315 (1983)