Neutron scattering experiments on the spin-triplet superconductor UTe2 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 a^-axis. Up to fields of μ0H=13 T, the maximal inelastic neutron spectral weight increases in energy transfer, with a pronounced increase in dℏωpeak/dH near μ0H=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 a^-axis fields near μ0H=7~T induce a change in the hybridization between heavy f-electrons and the bare conduction band.
@article{arxiv.2603.17037,
title = {Field-direction sensitivity of Kondo hybridization in UTe$_2$},
author = {Thomas Halloran and Gicela Saucedo Salas and Sylvia K. Lewin and J. A. Rodriguez-Rivera and Colin L. Sarkis and Jakob Lass and Daniel G. Mazzone and Marc Janoschek and Nicholas P. Butch},
journal= {arXiv preprint arXiv:2603.17037},
year = {2026}
}