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.

References in corpus (3)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Hidden Magnetism and Quantum Criticality in the Heavy Fermion Superconductor CeRhIn5
• The Missing Link: Magnetism and Superconductivity

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