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: | , , , , , , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
28 December 2020
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| 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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| 245 | 1 | 0 | |a Possible multiorbital ground state in CeCu2Si2 |c 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 |
| 246 | 3 | 3 | |a Possible multiorbital ground state in CeCu 2 Si 2 |
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| 520 | |a 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. | ||
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| 700 | 1 | |a Willers, Thomas |e VerfasserIn |4 aut | |
| 700 | 1 | |a Choukani, Fadi |e VerfasserIn |4 aut | |
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