Newly discovered superconductivity in the heavy-fermion material UTe2 below 1.7 K shows a number of peculiar aspects. Unlike the ferromagnetic superconductors, no magnetic order is observed down to 25 mK. Recent high field XMCD experiments at the uranium M4,5 edge [1] reveal the spin and orbital magnetic moments of the 5f -shell. In this work we consider theoretically the spin and orbital magnetic moments of UTe2 in the external magnetic field. We apply the DFT+U(ED) method based on a combination of DFT with many-body exact diagonalization of the Anderson impurity model. The ratio RLS calculated with DFT+U(ED) is in a good quantitative agreement with the XMCD data [1], while magnitudes of MS and ML exceed the values obtained from the sum rule analysis. Both XMCD and DFT+U(ED) support the intermediate valence of uranium with 34% of f 2 and 57% of f 3 configurations as well as itinerant-localized dichotomy in metallic actinide compounds. Support from GACR grant No. 24-11992S, MSMT TERAFIT - CZ.02.01.01/00/22_008/0004594 and MOIA grant No. 714471 is acknowledged.
[1] F. Wilhelm et al., Comm. Phys. 6, 96 (2023).
