Direct observation of interacting Kondo screened 4f moments in CePt5 with XMCD
C. Praetorius, A. Koehl, B. Muenzing, H. Bardenhagen, K. Fauth
TL;DR
This study employs XMCD to directly observe Kondo screening of 4f moments in CePt5 surface alloys, revealing the influence of crystal fields and ferromagnetic correlations on magnetic behavior across a range of temperatures.
Contribution
It provides the first direct experimental evidence of Kondo screening of both spin and orbital 4f moments using XMCD in CePt5 alloys.
Findings
Kondo screening of 4f moments confirmed by XMCD
Anisotropic paramagnetic response influenced by crystal field and ferromagnetic correlations
No magnetic coherence signatures observed above 13 K
Abstract
We use x-ray absorption and magnetic circular dichroism to study electronic configuration and local susceptibility of CePt5/Pt(111) surface alloys from well above to well below the impurity Kondo temperature. The anisotropic paramagnetic response is governed by the hexagonal crystal field and ferromagnetic correlations, with modified parameters for Ce moments residing next to the alloy surface. Quantitative XMCD evaluations provide direct evidence of Kondo screening of both spin and orbital 4f moments. Magnetic signatures of coherence are not apparent for T >= 13 K.
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Taxonomy
TopicsRare-earth and actinide compounds · Inorganic Chemistry and Materials · Nuclear physics research studies