Neutron scattering experiments on the spin-triplet superconductor ${\mathrm{UTe}}_2$ have established that the dominant low-energy magnetic response is along Brillouin zone boundaries, resembling the magnetic susceptibility of narrow-gap interband excitations. We report a study of the sensitivity of these excitations to magnetic field along the crystallographic $\widehat{a}$ axis. Up to fields of ${\mu }_{0}H\hspace{0.17em}=\hspace{0.17em}13$ T, the maximal inelastic neutron spectral weight increases in energy transfer, with a pronounced increase in $d\hslash {\omega }_{\mathrm{peak}}/dH$ near ${\mu }_{0}H\hspace{0.17em}=\hspace{0.17em}7$ T. This behavior parallels the field- and temperature-dependent features of the electrical resistivity that are associated with Kondo hybridization. Our measurements suggest that $\widehat{a}$ axis fields near ${\mu }_{0}H\hspace{0.17em}=\hspace{0.17em}7$ T induce a change in the hybridization between heavy $f$ electrons and the bare conduction band.

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• Kondo effect
• Magnetic anisotropy
• Magnetic interactions
• Spin dynamics
• Strongly correlated systems
• Unconventional superconductors
• Inelastic neutron scattering
• Resistivity measurements