Determining the in-plane orientation of the ground-state orbital of CeCu2Si2

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 q dependent non-resonant inelastic x-ray scattering (NIXS) experiments at the cerium N4,5 edge. The observed difference between the two different directions q||[100] and q||[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 NIXS. 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 quasi-particles and their interactions in heavy-fermion systems.

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• Theoretical prediction and spectroscopic fingerprints of an orbital transition in CeCu2Si2
• 4$f$ crystal field ground state of the strongly correlated topological insulator SmB${}_6$
• CeRu${}_4$Sn${}_6$: a strongly correlated material with nontrivial topology
• Direct bulk sensitive probe of 5f symmetry in URu2Si2
• Synchrotron Radiation Techniques and their Application to Actinide Materials
• Probing Strongly Correlated 4f-Orbital Symmetry of the Ground State in Yb Compounds by Linear Dichroism in Core-Level Photoemission
• High-resolution resonant inelastic soft X-ray scattering as a probe of the crystal electrical field in lanthanides demonstrated for the case of CeRh2Si2
• Direct imaging of orbitals in quantum materials
• Spectroscopic evidence of Kondo-induced quasi-quartet in CeRh${}_2$As${}_2$
• U 5$f$ crystal-field ground state of UO${}_2$ probed by directional dichroism in nonresonant inelastic x-ray scattering
• Determining the local low-energy excitations in the Kondo semimetal CeRu${}_4$Sn${}_6$ using resonant inelastic x-ray scattering
• Possible multi-orbital ground state in CeCu${}_2$Si${}_2$
• The quartet ground state in CeB${}_6$: an inelastic x-ray scattering study
• Orientation of ground-state orbital in CeCoIn${}_5$ and CeRhIn${}_5$
• Ubiquity of Unconventional Phenomena Associated with Critical Valence Fluctuations in Heavy Fermion Metals
• Crystal field excitation in the chiral helimagnet YbNi${}_3$Al${}_9$
• Optical Process of Linear Dichroism in Angle-Resolved Core-Level Photoemission Reflecting Strongly Correlated Anisotropic Orbital Symmetry
• Exploring small energy scales with x-ray absorption and dichroism
• Selective orbital imaging of excited states with x-ray spectroscopy: the example of $\alpha$-MnS
• f-electron charge densities probed using core level non-resonant inelastic x-ray scattering
• First-Principles Study of the Fermi Surface Topology of CeCu${}_2$Si${}_2$