Amorese, Andrea, Marino, Andrea, Sundermann, Martin, Chen, Kai, Hu, Zhiwei, Willers, Thomas, Choukani, Fadi, Ohresser, Philippe, Herrero-Martin, Javier, Agrestini, Stefano, Chen, Chien-Te, Lin, Hong-Ji, Haverkort, Maurits W., Seiro, Silvia, Geibel, Christoph, Steglich, Frank, Tjeng, Liu Hao, Zwicknagl, Gertrud and Severing, Andrea (2020). Possible multiorbital ground state in CeCu2Si2. Phys. Rev. B, 102 (24). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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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 (T-c = 0.6 K), Kondo (T-K approximate to 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 Gamma((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 4f(0) 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 Gamma(6) state and Gamma((2))(7) crystal-field states are mixed into the primarily Gamma((1))(7) ground state. This estimate is also supported by renormalized band-structure calculations that uses the experimentally determined crystal-field scheme.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Amorese, AndreaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Marino, AndreaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sundermann, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chen, KaiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hu, ZhiweiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Willers, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Choukani, FadiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ohresser, PhilippeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Herrero-Martin, JavierUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Agrestini, StefanoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chen, Chien-TeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lin, Hong-JiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Haverkort, Maurits W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Seiro, SilviaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Geibel, ChristophUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Steglich, FrankUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tjeng, Liu HaoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zwicknagl, GertrudUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Severing, AndreaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-307378
DOI: 10.1103/PhysRevB.102.245146
Journal or Publication Title: Phys. Rev. B
Volume: 102
Number: 24
Date: 2020
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
QUASI-PARTICLES; SUPERCONDUCTIVITY; SCATTERINGMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/30737

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