Determining the in-plane orientation of the ground-state orbital of CeCu 2Si 2
We have successfully determined the hitherto unknown sign of the B44 Stevens crystal-field parameter of the tetragonal heavy-fermion compound CeCu2Si2 using vector ˆq-dependent nonresonant inelastic x-ray scattering experiments at the cerium N4,5 edge. The observed difference between the two differe...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
23 July 2012
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| In: |
Physical review letters
Year: 2012, Volume: 109, Issue: 4, Pages: 046401 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.109.046401 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevLett.109.046401 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.109.046401 
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| Author Notes: | T. Willers, F. Strigari, N. Hiraoka, Y.Q. Cai, M.W. Haverkort, K.-D. Tsuei, Y.F. Liao, S. Seiro, C. Geibel, F. Steglich, L.H. Tjeng, and A. Severing |
| Summary: | We have successfully determined the hitherto unknown sign of the B44 Stevens crystal-field parameter of the tetragonal heavy-fermion compound CeCu2Si2 using vector ˆq-dependent nonresonant inelastic x-ray scattering experiments at the cerium N4,5 edge. The observed difference between the two different directions, ˆq∥[100] and ˆq∥[110], is due to the anisotropy of the crystal-field ground state in the (001) plane and is observable only because of the utilization of higher than dipole transitions possible in nonresonant inelastic x-ray scattering. This approach allows us to go beyond the specific limitations of dc magnetic susceptibility, inelastic neutron scattering, and soft x-ray spectroscopy, and provides us with a reliable information about the orbital state of the 4f electrons relevant for the quantitative modeling of the quasiparticles and their interactions in heavy-fermion systems. |
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| Item Description: | Die Ziffer 2 im Titel ist zweimal tiefgestellt Gesehen am 06.10.2017 |
| Physical Description: | Online Resource |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.109.046401 |