Journal Article

PUBDB-2023-05121

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Fe substitution in URu$_2$Si$_2$ : Singlet magnetism in an extended Doniach phase diagram

Marino, A.Extern* ; Christovam, D. S.Extern* ; Chang, C.-F.Extern* ; Falke, J. ; Kuo, C.-Y.Extern* ; Wu, C.-N. ; Sundermann, M.Extern* ; Amorese, A. (Corresponding author)Extern* ; Gretarsson, H.DESY* ; Lee-Wong, E. ; Moir, C. M. ; Deng, Y. ; Maple, M. B. ; Thalmeier, P. ; Tjeng, L. H. ; Severing, A. (Corresponding author)Extern*

2023
Inst. Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevB.108.085128  doi:10.3204/PUBDB-2023-05121

Abstract: The application of pressure as well as the successive substitution of Ru with Fe in the hidden order (HO) compound URu$_2$Si$_2$ leads to the formation of the large-moment antiferromagnetic phase. Here, we investigate the substitution series URu$_{2−x}$FexSi$_2$ from x=0.0 to 2.0 by U 4f core-level photoelectron spectroscopy and observe nonmonotonic changes in the spectra. The initial increase and subsequent decrease in the spectral weight of the 4f core-level satellite with increasing x stands for a nonmonotonic 5f filling across the substitution series. The competition of chemical pressure and increase in the density of states at the Fermi energy, both due to substitution of Ru with Fe, can explain such behavior. An extended Doniach phase diagram including the x dependence of the density of states is proposed. Also in URu$_{2−x}$FexSi$_2$ the ground state is a singlet or quasidoublet state consisting of two singlets. Hence, the formation of magnetic order in the URu$_{2−x}$FexSi$_2$ substitution series must be explained within a singlet magnetism model.

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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 - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Web of Science Core Collection

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