Determining the in-plane orientation of the ground-state orbital of CeCu 2Si 2

• Verfasst von: Willers, Thomas [VerfasserIn]
• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Titel: Determining the in-plane orientation of the ground-state orbital of CeCu 2Si 2
• Verf.angabe: 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
• Fussnoten: Die Ziffer 2 im Titel ist zweimal tiefgestellt ; Gesehen am 06.10.2017
• Titel Quelle: Enthalten in: Physical review letters
• Jahr Quelle: 2012
• Band/Heft Quelle: 109(2012,4) Artikel-Nummer 046401, 5 Seiten
• ISSN Quelle: 1079-7114
• DOI: doi:10.1103/PhysRevLett.109.046401
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1564142213

Abstract

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.