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.

References in corpus (6)

• Feedback spin resonance in superconducting CeCu${}_2$Si${}_2$ and CeCoIn${}_5$
• Non-resonant inelastic x-ray scattering involving excitonic excitations
• Crystal-field and Kondo scale investigation of CeMIn5 (M=Co, Ir and Rh): a combined x-ray absorption and inelastic neutron study
• High multipole transitions in NIXS: valence and hybridization in 4f systems
• Layered Kondo lattice model for quantum critical beta-YbAlB4
• Determining the crystal-field ground state in rare earth Heavy Fermion materials using soft-x-ray absorption spectroscopy

Cited by in corpus (15)

• Multiple quantum phase transitions and superconductivity in Ce-based heavy fermions
• Emergent loop-nodal s${}_{\pm }$-wave superconductivity in CeCu${}_2$Si${}_2$: similarities to the iron-based superconductors
• 4$f$ crystal field ground state of the strongly correlated topological insulator SmB${}_6$
• 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
• Direct imaging of orbitals in quantum materials
• Spectroscopic evidence of Kondo-induced quasi-quartet in CeRh${}_2$As${}_2$
• 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${}_5$
• Crystal field excitation in the chiral helimagnet YbNi${}_3$Al${}_9$
• 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${}_2$