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Article Dans Une Revue Electronic Structure Année : 2021

Resonant photoemission spectroscopy of the ferromagnetic Kondo system CeAgSb 2

Résumé

We study the electronic structure of single crystal CeAgSb2, a low Tc ferromagnetic Kondo system, using synchrotron radiation photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). We have carried out Ce 5s, Ce 5p, Sb 4d core level PES as well as Ce 4d–4f resonant PES of the valence band states of CeAgSb2. We also report the resonant PES behavior of Ce 5s and 5p core-levels and the simultaneous intensity suppression of Sb 4d core-level and Ag 4d valence band states across the Ce 4d–4f threshold. The Ce 4d–4f resonant valence band spectra show typical f0 and f1 features associated with Kondo behavior. The constant initial state spectra of the f0 and f1 features show maxima at different incident photon energies, arising from different relative contributions of surface and bulk character Ce 4f partial density of states. XAS across the Ce 3d–4f M-edge also shows the corresponding final state f1 and f2 features. The weak temperature dependence of the XAS spectra between T = 25 K and 300 K could be simulated using a full multiplet calculation combined with a simplified single-impurity Anderson model approach. The calculations confirm the Kondo screening and allows quantification of the bulk Ce 4f electron count in CeAgSb2. The Ce 5s states show an exchange splitting which reflects the local magnetic moment of Ce 4f states. The overall results characterize the bulk and surface sensitive Ce 4f states, and indicate the role of Kondo effect in forming the moderately enhanced heavy-fermion carriers in CeAgSb2.
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Dates et versions

hal-04620647 , version 1 (21-06-2024)

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Chien-Wen Chuang, Bodry Tegomo Chiogo, Daniel Malterre, Pei-Yun Chuang, Cheng-Maw Cheng, et al.. Resonant photoemission spectroscopy of the ferromagnetic Kondo system CeAgSb 2. Electronic Structure, 2021, 3 (3), pp.034001. ⟨10.1088/2516-1075/ac0c25⟩. ⟨hal-04620647⟩
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