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  Unexpected differences between surface and bulk spectroscopic and implied Kondo properties of heavy fermion CeRh2Si2

Poelchen, G., Schulz, S., Mende, M., Guettler, M., Generalov, A., Fedorov V, A., et al. (2020). Unexpected differences between surface and bulk spectroscopic and implied Kondo properties of heavy fermion CeRh2Si2. npj Quantum Materials, 5(1): 70, pp. 1-7. doi:10.1038/s41535-020-00273-7.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-5CA4-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-5CAD-0
Genre: Journal Article

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 Creators:
Poelchen, Georg1, Author
Schulz, Susanne1, Author
Mende, Max1, Author
Guettler, Monika1, Author
Generalov, Alexander1, Author
Fedorov V, Alexander1, Author
Caroca-Canales, Nubia2, Author              
Geibel, Christoph3, Author              
Kliemt, Kristin1, Author
Krellner, Cornelius1, Author
Danzenbaecher, Steffen1, Author
Usachov, Dmitry Yu1, Author
Dudin, Pavel1, Author
Antonov, Victor N.1, Author
Allen, James W.1, Author
Laubschat, Clemens1, Author
Kummer, Kurt1, Author
Kucherenko, Yuri1, Author
Vyalikh, Denis V.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              

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 Abstract: Ultra-violet angle-resolved photoemission spectroscopy (UV-ARPES) was used to explore the temperature dependence of the Ce-4fspectral responses for surface and bulk in the antiferromagnetic Kondo lattice CeRh2Si2. Spectra were taken from Ce- and Si-terminated surfaces in a wide temperature range, and reveal characteristic 4fpatterns for weakly (surface) and strongly (bulk) hybridized Ce, respectively. The temperature dependence of the Fermi level peak differs strongly for both cases implying that the effective Kondo temperature at the surface and bulk can be rather distinct. The greatly reduced crystal-electric-field (CEF) splitting at the surface gives reason to believe that the surface may exhibit a larger effective Kondo temperature because of a higher local-moment effective degeneracy. Further, the hybridization processes could strongly affect the 4fpeak intensity at the Fermi level. We derived thek-resolved dispersion of the Kondo peak which is also found to be distinct due to different sets of itinerant bands to which the 4fstates of surface and bulk Ce are coupled. Overall our study brings into reach the ultimate goal of quantitatively testing many-body theories that link spectroscopy and transport properties, for both the bulk and the surface, separately. It also allows for a direct insight into the broader problem of Kondo lattices with two different local-moment sublattices, providing some understanding of why the cross-talking between the two Kondo effects is weak.

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Language(s): eng - English
 Dates: 2020-10-062020-10-06
 Publication Status: Published in print
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Title: npj Quantum Materials
  Other : npj Quantum Mater.
Source Genre: Journal
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Publ. Info: [London] : Nature Publishing Group
Pages: - Volume / Issue: 5 (1) Sequence Number: 70 Start / End Page: 1 - 7 Identifier: ISSN: 2397-4648
CoNE: https://pure.mpg.de/cone/journals/resource/2397-4648