Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 59: Metal Substrates I
O 59.5: Talk
Wednesday, April 2, 2014, 17:00–17:15, WIL A317
Thickness-dependent growth study of Pt-Ce alloys on Pt(111) — •Jeannette Kemmer, Andreas Krönlein, Pin-Jui Hsu, and Matthias Bode — Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
Recently angle-resolved photoemission spectroscopy has revealed the formation of the coherent low-energy heavy-fermion band near the Fermi level on the CePt5 surface alloy on Pt(111) [1]. We have investigated the coverage-dependent morphology of the various Pt-Ce surface alloys which form upon Ce deposition onto Pt(111) with a home-built low-temperature scanning tunneling microscope. Within the coverage range from 9.6 × 1018 atoms/m2 to 34 × 1018 atoms/m2 topographic constant-current images show several superstructures similar to those previously reported by Baddeley et al. [2]. While the coexistence of different superstructures is observed for low Ce coverages, much higher mounts of Ce lead to the formation of clusters, possibly due to segregation of excess Ce. An optimal surface quality is found for a Ce coverage of 19 × 1018 atoms/m2. We will also discuss the electronic properties of the Ce superstructures as observed by scanning tunneling spectroscopy.
[1] M. Klein et al.,
Phys. Rev. Lett. 106, 186407 (2011).
C. J. Baddeley et al.,
Phys. Rev. B 56, 12 589 (1997).