Journal Article

PUBDB-2023-04840

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Singlet magnetism in intermetallic $UGa_2$ unveiled by inelastic x-ray scattering

Marino, A.Extern* ; Sundermann, M.Extern* ; Christovam, D. S.Extern* ; Amorese, A. ; Chang, C.-F. ; Dolmantas, P.Extern* ; Said, A. H.Extern* ; Gretarsson, H.DESY* ; Keimer, B.Extern* ; Haverkort, M. W.Extern*XFEL.EU* ; Andreev, A. V. ; Havela, L. ; Thalmeier, P. ; Tjeng, L. H.Extern* ; Severing, A. (Corresponding author)Extern*

2023
Inst. Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevB.108.045142  doi:10.3204/PUBDB-2023-04840

Abstract: Using high resolution tender x-ray resonant inelastic scattering and hard x-ray nonresonant inelastic scattering beyond the dipole limit we were able to detect electronic excitations in intermetallic UGa$_2$ that are highly atomic in nature. Analysis of the spectral lineshape reveals that the local 5f$^2$ configuration characterizes the correlated nature of this ferromagnet. The orientation and directional dependence of the spectra indicate that the ground state is made of the $Γ_1$ singlet and/or $Γ_6$ doublet symmetry. With the ordered moment in the ab plane, we infer that the magnetism originates from the higher lying $Γ_6$ doublet being mixed with the $Γ_1$ singlet due to intersite exchange, qualifying UGa$_2$ to be a true quantum magnet. The ability to observe atomic excitations is crucial to resolve the ongoing debate about the degree of localization versus itineracy in U intermetallics.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. PETRA-S (FS-PETRA-S)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
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 2023

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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 ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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