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SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 9: f-Electron Systems and Heavy Fermions II

TT 9.5: Vortrag

Montag, 27. März 2023, 16:00–16:15, HSZ 201

f2 multiplet states in low energy excitations of UTe2 — •Denise S. Christovam1, Martin Sundermann1,2, Andrea Marino1, Daisuke Takegami1, Johannes Falke1, Paulius Dolmantas1, Hlynur Gretarsson2,3, Bernhard Keimer3, Priscila F. S. Rosa4, Andrea Severing1,5, and Liu Hao Tjeng11MPI-CPfS, Dresden, Germany — 2DESY/PETRA-III, Hamburg, Germany — 3MPI-FKF, Stuttgart, Germany — 4LANL, Los Alamos, USA — 5Institute of Physics II, University of Cologne, Germany

Here we have investigated UTe2, proposed to be a topological spin-triplet superconductor, with high-resolution resonant inelastic x-ray scattering (RIXS) at the U M4,5 edges. Using this new experimental method, we can clearly observe the presence of U 5f atomic multiplet states in the low energy excitation spectrum of UTe2. This establishes the correlated nature of the material and questions the applicability of band theory to describe quantitatively its electronic structure. We find that the observed multiplet structure belongs to the U4+ 5f2 configuration. This is also surprising since half of the Te in this material have very short Te-Te distances, suggesting that half of the Te has a valence close to 1- rather than 2-, with the consequence that the U is expected to be 3+ rather than 4+. We speculate that the U 6d shell absorbs the extra charge, and that the local U charge configuration could be written as 5f26d1.

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