Singlet magnetism in intermetallic UGa$_2$ unveiled by inelastic x-ray scattering
| Autor: | Marino, Andrea, Sundermann, Martin, Christovam, Denise S., Amorese, Andrea, Chang, Chun-Fu, Dolmantas, Paulius, Said, Ayman H., Grrtarsson, Hlynur, Keimer, Bernhard, Haverkort, Maurits W., Andreev, Alexander V., Havela, Ladilav, Thalmeier, Peter, Tjeng, Liu Hao, Severing, Andrea |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 108, 045142 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.108.045142 |
| Popis: | Using high resolution tender-x-ray resonant inelastic scattering and hard-x-ray non-resonant 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 $\Gamma_1$ singlet and/or $\Gamma_6$ doublet symmetry. With the ordered moment in the $ab$ plane, we infer that the magnetism originates from the higher lying $\Gamma_6$ doublet being mixed with the $\Gamma_1$ singlet due to inter-site exchange, qualifying UGa$_2$ to be a true quantum magnet. The ability to observe atomic excitations is crucial to resolve the on-going debate about the degree of localization versus itineracy in U intermetallics. Comment: 9 pages, 7 figures |
| Databáze: | arXiv |
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