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Free keywords:
Arsenic compounds, Cerium compounds, Circular dichroism spectroscopy, Ground state, Temperature distribution, X ray absorption spectroscopy, X ray scattering, Core level photoelectrons, Crystal fields, Field ground, Heavy fermion compounds, Low-temperature properties, Multiphases, Ordered phasis, Quartet state, Spectroscopic evidence, X-ray spectroscopy, Dichroism
Abstract:
CeRh2As2 is a new multiphase superconductor with strong suggestions for an additional itinerant multipolar ordered phase. The modeling of the low-temperature properties of this heavy-fermion compound requires a quartet Ce3+ crystal-field ground state. Here, we provide the evidence for the formation of such a quartet state using x-ray spectroscopy. Core-level photoelectron and x-ray absorption spectroscopy confirm the presence of Kondo hybridization in CeRh2As2. The temperature dependence of the linear dichroism unambiguously reveals the impact of Kondo physics for coupling the Kramer's doublets into an effective quasiquartet. Nonresonant inelastic x-ray scattering data find that the |Γ7- © state with its lobes along the 110 direction of the tetragonal structure (xy orientation) contributes most to the multiorbital ground state of CeRh2As2.
