Connection between f-electron correlations and magnetic excitations in UTe2

Halloran, Thomas; Czajka, Peter; Salas, Gicela Saucedo; Frank, Corey E.; Kang, Chang-Jong; Rodriguez-Rivera, J. A.; Lass, Jakob; Mazzone, Daniel G.; Janoschek, Marc; Kotliar, Gabriel; Butch, Nicholas P.

doi:10.1038/s41535-024-00720-9

Title: Connection between f-electron correlations and magnetic excitations in UTe₂

Journal Article · 04 January 2025 · npj Quantum Materials

DOI: https://doi.org/10.1038/s41535-024-00720-9 · OSTI ID:2510444

^[1]; Czajka, Peter ^[1]; Salas, Gicela Saucedo ^[1];

^[1];

^[2]; Rodriguez-Rivera, J. A. ^[1];

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^[6];

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National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
Chungnam National Univ., Daejeon (Korea, Republic of)
Paul Scherrer Inst. (PSI), Villigen (Switzerland); Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Paul Scherrer Inst. (PSI), Villigen (Switzerland); Univ. of Zurich (Switzerland)
Rutgers Univ., Piscataway, NJ (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

The detailed anisotropic dispersion of the low-temperature, low-energy magnetic excitations of the candidate spin-triplet superconductor UTe₂ is revealed using inelastic neutron scattering. The magnetic excitations emerge from the Brillouin zone boundary at the high symmetry Y and T points and disperse along the crystallographic $$\hat{b}$$ -axis. In applied magnetic fields to at least μ₀H = 11 T along the $$\hat{c}-{\rm{axis}}$$ , the magnetism is found to be field-independent in the (hk0) plane. The scattering intensity is consistent with that expected from U³⁺/U⁴⁺ f-electron spins with preferential orientation along the crystallographic $$\hat{a}$$ -axis, and a fluctuating magnetic moment of μ_eff=1.7(5) μ_B. We propose interband spin excitons arising from f-electron hybridization as a possible origin of the magnetic excitations in UTe₂.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 2510444

Report Number(s):: BNL--227551-2025-JAAM

Journal Information:: npj Quantum Materials, Journal Name: npj Quantum Materials Journal Issue: 1 Vol. 10; ISSN 2397-4648

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Connection between f-electron correlations and magnetic excitations in UTe₂