Orientation of the ground-state orbital in CeCo5 and CeRhIn5
We present core level nonresonant inelastic x-ray scattering (NIXS) data of the heavy-fermion compounds CeCoIn5 and CeRhIn5 measured at the Ce N4,5 edges. The higher than dipole transitions in NIXS allow determining the orientation of the Γ7 crystal-field ground-state orbital within the unit cell. T...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
21 June 2019
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| In: |
Physical review
Year: 2019, Volume: 99, Issue: 23 |
| ISSN: | 2469-9969 |
| DOI: | 10.1103/PhysRevB.99.235143 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1103/PhysRevB.99.235143 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.99.235143 
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| Author Notes: | M. Sundermann, A. Amorese, F. Strigari, B. Leedahl, L.H. Tjeng, M.W. Haverkort, H. Gretarsson, H. Yavaş, M. Moretti Sala, E.D. Bauer, P.F.S. Rosa, J.D. Thompson, and A. Severing |
| Summary: | We present core level nonresonant inelastic x-ray scattering (NIXS) data of the heavy-fermion compounds CeCoIn5 and CeRhIn5 measured at the Ce N4,5 edges. The higher than dipole transitions in NIXS allow determining the orientation of the Γ7 crystal-field ground-state orbital within the unit cell. The crystal-field parameters of the CeMIn5 compounds and related substitution phase diagrams have been investigated in great detail in the past; however, whether the ground-state wave function is the Γ+7(x2−y2) or Γ−7(xy orientation) remained undetermined. We show that the Γ−7 doublet with lobes along the (110) direction forms the ground state in CeCoIn5 and CeRhIn5. For CeCoIn5, however, we find also some contribution of the first excited state crystal-field state in the ground state due to the stronger hybridization of 4f and conduction electrons, suggesting a smaller α2 value than originally anticipated from x-ray absorption. A comparison is made to the results of existing density functional theory plus dynamical mean-field theory calculations. |
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| Item Description: | Im Titel ist die Zahl "5" tiefgestellt Gesehen am 08.08.2019 |
| Physical Description: | Online Resource |
| ISSN: | 2469-9969 |
| DOI: | 10.1103/PhysRevB.99.235143 |