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- W3021806114 abstract "Using inelastic x-ray scattering beyond the dipole limit and hard x-ray photoelectron spectroscopy we establish the dual nature of the U $5f$ electrons in UM$_2$Si$_2$ (M = Pd, Ni, Ru, Fe), regardless of their degree of delocalization. We have observed that the compounds have in common a local atomic-like state that is well described by the U $5f^2$ configuration with the $Gamma_1^{(1)}$ and $Gamma_2$ quasi-doublet symmetry. The amount of the U 5$f^3$ configuration, however, varies considerably across the UM$_2$Si$_2$ series, indicating an increase of U5$f$ itineracy in going from M=Pd to Ni to Ru, and to the Fe compound. The identified electronic states explain the formation of the very large ordered magnetic moments in UPd$_2$Si$_2$ and UNi$_2$Si$_2$, the availability of orbital degrees of freedom needed for the hidden order in URu$_2$Si$_2$ to occur, as well as the appearance of Pauli paramagnetism in UFe$_2$Si$_2$. A unified and systematic picture of the U$M_2$Si$_2$ compounds may now be drawn, thereby providing suggestions for new experiments to induce hidden order and/or superconductivity in U compounds with the tetragonal body-centered ThCr$_2$Si$_2$ structure." @default.
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- W3021806114 date "2020-11-17" @default.
- W3021806114 modified "2023-09-28" @default.
- W3021806114 title "From antiferromagnetic and hidden order to Pauli paramagnetism in U <i>M</i> <sub>2</sub> Si <sub>2</sub> compounds with 5 <i>f</i> electron duality" @default.
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- W3021806114 doi "https://doi.org/10.1073/pnas.2005701117" @default.
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