Spectroscopic Evidence of Kondo-Induced Quasiquartet in CeRh 2 As 2

Christovam, Denise S.; Ferreira-Carvalho, Miguel; Marino, Andrea; Sundermann, Martin; Takegami, Daisuke; Melendez-Sans, Anna; Tsuei, Ku Ding; Hu, Zhiwei; Rößler, Sahana; Valvidares, Manuel; Haverkort, Maurits W.; Liu, Yu; Bauer, Eric D.; Tjeng, Liu Hao; Zwicknagl, Gertrud; Severing, Andrea

doi:10.1103/PhysRevLett.132.046401

Spectroscopic Evidence of Kondo-Induced Quasiquartet in ${CeRh}_{2} {As}_{2}$

Journal Article · Mon Jan 22 00:00:00 EST 2024 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.132.046401· OSTI ID:2282223

; ; Marino, Andrea; Sundermann, Martin; ; ; Tsuei, Ku Ding; Hu, Zhiwei; ; ; Haverkort, Maurits W.; ; ; ; ;

${CeRh}_{2} {As}_{2}$ 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 ( $x y$ orientation) contributes most to the multiorbital ground state of ${CeRh}_{2} {As}_{2}$ .

Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI ID:: 2282223

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 132; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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