Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.8: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Crystal field splitting in CePt5: magnetic analysis and Raman spectroscopy — •Martin Zinner1, Benedikt Halbig2, Utz Bass2, Christian Praetorius1, Jean Geurts2, and Kai Fauth11Universität Würzburg, Experimentelle Physik II, 97074 Würzburg, Germany — 2Universität Würzburg, Experimentelle Physik III, 97074 Würzburg, Germany

The crystal electric field (CF) is an essential factor determining the paramagnetic response of rare earth ions in solids. In Ce intermetallics, Kondo screening can additionally modify the magnetic behavior and it may then prove difficult to disentangle the two. In the hexagonal surface intermetallic CePt5, grown on Pt(111) [1], we find two distinct sets of CF parameters which both account rather well for the anisotropic magnetic susceptibility and its temperature dependence. Different strengths of Kondo screening have to be assumed in the two cases in order to obtain quantitative agreement with experimental results.

Discriminating between the two solutions requires an independent determination of the CF splitting. We shall report on our attempts to obtain this information from electronic Raman scattering. Raman signal is indeed even obtained from CePt5 specimens with a thickness of just two unit cells. We shall discuss the identification of electronic Raman losses by comparison with LaPt5 as well as the dependence of the Raman features on temperature and thickness of the intermetallic film.

[1] J. Kemmer, C. Praetorius et al., Phys. Rev. B 90, 195401 (2014).

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