Journal Article

PUBDB-2024-00409

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Spectroscopic Evidence of Kondo-Induced Quasiquartet in CeRh$_2$As$_2$

Christovam, D. S. (Corresponding author)Extern* ; Ferreira-Carvalho, M. ; Marino, A. ; Sundermann, M.Extern*DESY* ; Takegami, D.Extern* ; Melendez-Sans, A. ; Tsuei, K. D. ; Hu, Z.Extern* ; Rößler, S.Extern* ; Valvidares, M. ; Haverkort, M. W.Extern*XFEL.EU* ; Liu, Y.Extern* ; Bauer, E. D. ; Tjeng, L. H.Extern* ; Zwicknagl, G. ; Severing, A. (Corresponding author)Extern*

2024
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevLett.132.046401  doi:10.3204/PUBDB-2024-00409

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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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. DFG project 387555779 - Von versteckter bis antiferromagnetischer Ordnung mit großem Moment in URu2Si2: eine Röntgenstrahluntersuchung der 5f Besetzung und Wellenfunktionssymmetrie. (387555779) (387555779)

Experiment(s):

1. PETRA Beamline P01 (PETRA III)

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; Nationallizenz ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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