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  • Letter

Identifying f-electron symmetries of UTe2 with O-edge resonant inelastic x-ray scattering

Shouzheng Liu1, Yishuai Xu1, Erica C. Kotta1, Lin Miao2, Sheng Ran3, Johnpierre Paglione4, Nicholas P. Butch5,4, Jonathan D. Denlinger6, Yi-De Chuang6 et al.

L. Andrew Wray1,*

  • 1Department of Physics, New York University, New York, New York 10003, USA
  • 2School of Physics, Southeast University, Nanjing 211189, China
  • 3Department of Physics, Washington University, St. Louis, Missouri 63130, USA
  • 4Quantum Materials Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA
  • 5NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
  • 6Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

  • *lawray@nyu.edu

Phys. Rev. B 106, L241111 – Published 26 December, 2022

DOI: https://doi.org/10.1103/PhysRevB.106.L241111

Abstract

The recent discovery of spin-triplet superconductivity emerging from a nonmagnetic parent state in UTe2 has stimulated great interest in the underlying mechanism of Cooper pairing. Experimental characterization of short-range electronic and magnetic correlations is vital to understanding these phenomena. Here we use resonant inelastic x-ray scattering (RIXS), x-ray absorption spectroscopy (XAS), and atomic-multiplet-based modeling to shed light on the active debate between 5f26d1-based models with singlet crystal field states versus 5f3-based models that predict atomic Kramers doublets and much greater 5f itinerancy. The XAS and RIXS data are found to agree strongly with predictions for a 5f26d1-like valence electron configuration with weak intradimer magnetic correlations, and provide a context for interpreting recent investigations of the electronic structure and superconducting pairing mechanism.

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