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Connection between f-electron correlations and magnetic excitations in UTe2

https://doi.org/10.1038/s41535-024-00720-9

Halloran, Thomas; Czajka, Peter; Saucedo_Salas, Gicela; Frank, Corey_E; Kang, Chang-Jong; Rodriguez-Rivera, J_A; Lass, Jakob; Mazzone, Daniel_G; Janoschek, Marc; Kotliar, Gabriel; et al (January 2025, npj Quantum Materials)

Abstract The detailed anisotropic dispersion of the low-temperature, low-energy magnetic excitations of the candidate spin-triplet superconductor UTe₂is revealed using inelastic neutron scattering. The magnetic excitations emerge from the Brillouin zone boundary at the high symmetryYandTpoints and disperse along the crystallographic$$\hat{b}$$ $\hat{b}$ -axis. In applied magnetic fields to at leastμ₀H= 11 T along the$$\hat{c}-{\rm{axis}}$$ $\hat{c} - axis$ , 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$$\hat{a}$$ $\hat{a}$ -axis, and a fluctuating magnetic moment ofμ_eff=1.7(5)μ_B. We propose interband spin excitons arising fromf-electron hybridization as a possible origin of the magnetic excitations in UTe₂.
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Absence of a bulk signature of a charge density wave in hard x-ray measurements of ${UTe}_{2}$

https://doi.org/10.1103/PhysRevB.110.145101

Kengle, Caitlin_S; Chaudhuri, Dipanjan; Guo, Xuefei; Johnson, Thomas_A; Bettler, Simon; Simeth, Wolfgang; Krogstad, Matthew_J; Islam, Zahir; Ran, Sheng; Saha, Shanta_R; et al (October 2024, Physical Review B)
Absence of a bulk thermodynamic phase transition to a density wave phase in ${UTe}_{2}$

https://doi.org/10.1103/PhysRevB.110.144507

Theuss, Florian; Shragai, Avi; Grissonnanche, Gael; Peralta, Luciano; Simarro, Gregorio_de_la_Fuente; Hayes, Ian_M; Saha, Shanta_R; Eo, Yun_Suk; Suarez, Alonso; Salinas, Andrea_Capa; et al (October 2024, Physical Review B)

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