TY  - JOUR
AU  - Marino, Andrea
AU  - Christovam, Denise S.
AU  - Chang, Chun-Fu
AU  - Falke, Johannes
AU  - Kuo, Chang-Yang
AU  - Wu, Chi-Nan
AU  - Sundermann, Martin
AU  - Amorese, Andrea
AU  - Gretarsson, Hlynur
AU  - Lee-Wong, Eric
AU  - Moir, Camilla M.
AU  - Deng, Yuhang
AU  - Maple, M. Brian
AU  - Thalmeier, Peter
AU  - Tjeng, Liu Hao
AU  - Severing, Andrea
TI  - Fe substitution in URu<sub>2</sub>Si<sub>2</sub> : Singlet magnetism in an extended Doniach phase diagram
JO  - Physical review / B
VL  - 108
IS  - 8
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - PUBDB-2023-05121
SP  - 085128
PY  - 2023
AB  - The application of pressure as well as the successive substitution of Ru with Fe in the hidden order (HO) compound URu<sub>2</sub>Si<sub>2</sub> leads to the formation of the large-moment antiferromagnetic phase. Here, we investigate the substitution series URu<sub>2−x</sub>FexSi<sub>2</sub> 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<sub>2−x</sub>FexSi<sub>2</sub> the ground state is a singlet or quasidoublet state consisting of two singlets. Hence, the formation of magnetic order in the URu<sub>2−x</sub>FexSi<sub>2</sub> substitution series must be explained within a singlet magnetism model.  
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001105971400003
DO  - DOI:10.1103/PhysRevB.108.085128
UR  - https://bib-pubdb1.desy.de/record/589256
ER  -