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Possible multiorbital ground state in CeCu2Si2

The crystal-field ground-state wave function of CeCu2Si2 has been investigated with linearly polarized M-edge x-ray absorption spectroscopy from 250 mK to 250 K, thus covering the superconducting (Tc=0.6 K), Kondo (TK≈20 K), and Curie-Weiss regimes. The comparison with full multiplet calculations sh...

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Main Authors: Amorese, Andrea (Author) , Marino, Andrea (Author) , Sundermann, Martin (Author) , Chen, Kai (Author) , Hu, Zhiwei (Author) , Willers, Thomas (Author) , Choukani, Fadi (Author) , Ohresser, Philippe (Author) , Herrero-Martin, Javier (Author) , Agrestini, Stefano (Author) , Chen, Chien-Te (Author) , Lin, Hong-Ji (Author) , Haverkort, Maurits W. (Author) , Seiro, Silvia (Author) , Geibel, Christoph (Author) , Steglich, Frank (Author) , Tjeng, Liu Hao (Author) , Zwicknagl, Gertrud (Author) , Severing, Andrea (Author)
Format: Article (Journal)
Language:English
Published: 28 December 2020
In: Physical review
Year: 2020, Volume: 102, Issue: 24
ISSN:2469-9969
DOI:10.1103/PhysRevB.102.245146
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevB.102.245146
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.102.245146
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Author Notes:Andrea Amorese, Andrea Marino, Martin Sundermann, Kai Chen, Zhiwei Hu, Thomas Willers, Fadi Choukani, Philippe Ohresser, Javier Herrero-Martin, Stefano Agrestini, Chien-Te Chen, Hong-Ji Lin, Maurits W. Haverkort, Silvia Seiro, Christoph Geibel, Frank Steglich, Liu Hao Tjeng, Gertrud Zwicknagl, and Andrea Severing
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Summary:The crystal-field ground-state wave function of CeCu2Si2 has been investigated with linearly polarized M-edge x-ray absorption spectroscopy from 250 mK to 250 K, thus covering the superconducting (Tc=0.6 K), Kondo (TK≈20 K), and Curie-Weiss regimes. The comparison with full multiplet calculations shows that the temperature dependence of the experimental linear dichroism is well explained with a Γ(1)7 crystal-field ground state and the thermal population of excited states at around 30 meV. The crystal-field scheme does not change throughout the entire temperature range thus making the scenario of orbital switching unlikely. Spectroscopic evidence for the presence of the Ce 4f0 configuration in the ground state is consistent with the possibility for a multiorbital character of the ground state. We estimate from the Kondo temperature and crystal-field splitting energies that several percents of the higher lying Γ6 state and Γ(2)7 crystal-field states are mixed into the primarily Γ(1)7 ground state. This estimate is also supported by renormalized band-structure calculations that uses the experimentally determined crystal-field scheme.
Item Description:Im Titel ist die Ziffer "2" jeweils tiefgestellt
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Physical Description:Online Resource
ISSN:2469-9969
DOI:10.1103/PhysRevB.102.245146

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