0604820 - FZÚ 2025 RIV US eng J - Journal Article
Christovam, D.S. - Sundermann, M. - Marino, A. - Takegami, D. - Falke, J. - Dolmantas, P. - Harder, M. - Gretarsson, H. - Keimer, B. - Gloskovskii, A. - Haverkort, M.W. - Elfimov, I. - Zwicknagl, G. - Andreev, Alexander V. - Havela, L. - Bordelon, M.M. - Bauer, E.D. - Rosa, P.F.S. - Severing, A. - Tjeng, L.H.
Stabilization of U 5f² configuration in UTe₂ through U 6d dimers in the presence of Te2 chains.
Physical Review Research. Roč. 6, č. 3 (2024), č. článku 033299. E-ISSN 2643-1564
R&D Projects: GA MŠMT(CZ) EH22_008/0004591; GA ČR(CZ) GA21-09766S
Institutional support: RVO:68378271
Keywords : Uranium compounds * delocalization of 5f electrons * magnetic properties
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.5, year: 2023
Method of publishing: Open access
DOI: https://doi.org/10.1103/PhysRevResearch.6.033299

We investigate the topological superconductor candidate UTe2 using high-resolution valence-band resonant inelastic x-ray scattering at the U M-4,M-5 edges. We observe atomiclike low-energy excitations that support the correlated nature of this unconventional superconductor. These excitations originate from the U 5 f(2) configuration, which is unexpected since the short Te2-Te2 distances exclude Te2 being 2-. By utilizing the photoionization cross-section dependence of the photoemission spectra in combination with band structure calculations, we infer that the stabilization of the U 5 f(2) configuration is due to the U 6d bonding states in the U dimers acting as a charge reservoir. Our results emphasize that the description of the physical properties should commence with a 5 f(2) ansatz.
Permanent Link: https://hdl.handle.net/11104/0362325