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  Possible multiorbital ground state in CeCu2Si2

Amorese, A., Marino, A., Sundermann, M., Chen, K., Hu, Z., Willers, T., et al. (2020). Possible multiorbital ground state in CeCu2Si2. Physical Review B, 102: 245146, pp. 1-8. doi:10.1103/PhysRevB.102.245146.

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Amorese, Andrea1, Author              
Marino, Andrea1, Author              
Sundermann, Martin1, Author              
Chen, Kai2, Author
Hu, Zhiwei3, Author              
Willers, Thomas2, Author
Choukani, Fadi2, Author
Ohresser, Philippe2, Author
Herrero-Martin, Javier2, Author
Agrestini, Stefano4, Author              
Chen, Chien-Te2, Author
Lin, Hong-Ji2, Author
Haverkort, Maurits W.2, Author
Seiro, Silvia5, Author              
Geibel, Christoph6, Author              
Steglich, Frank7, Author              
Tjeng, Liu Hao8, Author              
Zwicknagl, Gertrud2, Author
Severing, Andrea1, Author              
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2External Organizations, ou_persistent22              
3Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              
4Stefano Agrestini, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863459              
5Silvia Seiro, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863473              
6Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              
7Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              
8Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863452              

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Free keywords: Cerium compounds, Copper compounds, Crystal structure, Crystals, Dichroism, Excited states, Silicon compounds, Temperature distribution, Wave functions, X ray absorption spectroscopy, Band structure calculation, Crystal-field splitting, Kondo temperatures, Linearly polarized, Spectroscopic evidence, Temperature dependence, Temperature range, Thermal population, Ground state
 Abstract: 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 Γ7(1) 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 Γ7(2) crystal-field states are mixed into the primarily Γ7(1) ground state. This estimate is also supported by renormalized band-structure calculations that uses the experimentally determined crystal-field scheme. © 2020 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

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Language(s): eng - English
 Dates: 2020-12-282020-12-28
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevB.102.245146
 Degree: -

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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 102 Sequence Number: 245146 Start / End Page: 1 - 8 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008