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Fe substitution in URu2Si2: Singlet magnetism in an extended Doniach phase diagram

MPS-Authors
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Marino,  Andrea
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Christovam,  Denise S.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Chang,  Chun-Fu
Chun-Fu Chang, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons257328

Falke,  Johannes
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Wu,  Chi-Nan
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons204679

Sundermann,  Martin
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Amorese,  Andrea
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126879

Thalmeier,  Peter
Peter Thalmeier, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tjeng,  Liu Hao
Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons204677

Severing,  Andrea
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Marino, A., Christovam, D. S., Chang, C.-F., Falke, J., Kuo, C.-Y., Wu, C.-N., et al. (2023). Fe substitution in URu2Si2: Singlet magnetism in an extended Doniach phase diagram. Physical Review B, 108(8): 085128, pp. 1-9. doi:10.1103/PhysRevB.108.085128.


Cite as: https://hdl.handle.net/21.11116/0000-000D-AEFC-4
Abstract
The application of pressure as well as the successive substitution of Ru with Fe in the hidden order (HO) compound URu2Si2 leads to the formation of the large-moment antiferromagnetic phase. Here, we investigate the substitution series URu2-xFexSi2 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 URu2-xFexSi2 the ground state is a singlet or quasidoublet state consisting of two singlets. Hence, the formation of magnetic order in the URu2-xFexSi2 substitution series must be explained within a singlet magnetism model. © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.