Spectroscopic Evidence of Kondo-Induced Quasiquartet in CeRh_{2}As_{2}.
Phys Rev Lett
; 132(4): 046401, 2024 Jan 26.
Article
in En
| MEDLINE
| ID: mdl-38335370
ABSTRACT
CeRh_{2}As_{2} 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 Ce^{3+} 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 CeRh_{2}As_{2}. 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 |Γ_{7}^{-}⟩ state with its lobes along the 110 direction of the tetragonal structure (xy orientation) contributes most to the multiorbital ground state of CeRh_{2}As_{2}.
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01-internacional
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MEDLINE
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En
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Phys Rev Lett
Year:
2024
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Article
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