Determining the crystal-field ground state in rare earth Heavy Fermion materials using soft-x-ray absorption spectroscopy

Abstract

We infer that soft-x-ray absorption spectroscopy is a versatile method for the determination of the crystal-field ground state symmetry of rare earth Heavy Fermion systems, complementing neutron scattering. Using realistic and universal parameters, we provide a theoretical mapping between the polarization dependence of Ce $M_{4,5}$ spectra and the charge distribution of the Ce $4f$ states. The experimental resolution can be orders of magnitude larger than the $4f$ crystal field splitting itself. To demonstrate the experimental feasibility of the method, we investigated CePd${}_2$Si${}_2$, thereby settling an existing disagreement about its crystal-field ground state.

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• Spectroscopic evidence of Kondo-induced quasi-quartet in CeRh${}_2$As${}_2$
• Determining electronic properties from L-edge X-ray absorption spectra of transition metal compounds with artificial neural networks
• 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${}_2$
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• 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
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• f-electron charge densities probed using core level non-resonant inelastic x-ray scattering
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