Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 47: Electronic Structure of Surfaces: Spectroscopy, Surface States
O 47.10: Poster
Dienstag, 8. März 2016, 18:15–20:30, Poster E
Thickness dependent electronic structure and Kondo resonance of CePt5 on Pt(111) — •Katharina Treiber, Henriette Maaß, Holger Schwab, Hendrik Bentmann, and Friedrich Reinert — Experimentelle Physik VII, Universität Würzburg, 97074 Würzburg
At low temperatures local interactions between Ce 4f— and conduction electrons in thin films of CePt5 on Pt(111) lead to a spectral feature at the Fermi surface — the Kondo resonance [1]. At even lower temperatures heavy quasiparticles interact and form coherent heavy fermion bands at the Fermi-level [2]. Whereas previous studies showed that the CePt5 surface alloy appears in a variety of different phases depending on Ce coverage and post annealing procedure [3], most photoemission studies have been carried out on a phase occurring at a surface coverage of four unit cells CePt5 on Pt(111).
In this contribution we examine the electronic structure of the different surface phases by angle-resolved photoemission (ARPES) at low temperatures considering Fermi surface, Kondo resonance and bandstructure. Furthermore, we explore the Kondo temperature which recently has been suggested to show a dependency on the CePt5 film thickness on the basis of x-ray absorption spectroscopy and x-ray magnetic circular dichroism studies [4].
[1] M. Garnier et al., Phys. Rev. B 56, R11399(R), (1997)
[2] M. Klein et al., Phys. Rev. Lett. 106, 186407, (2011)
[3] J. Tang et al., Phys. Rev. B 15, 15342, (1993)
[4] C. Praetorius et al., Phys. Rev. B 92, 045116, (2015)