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arXiv · 2603.17037

Field-direction sensitivity of Kondo hybridization in UTe$_2$

Thomas Halloran·Gicela Saucedo Salas·Sylvia K. Lewin·J. A. Rodriguez-Rivera·Colin L. Sarkis·Jakob Lass·Daniel G. Mazzone·Marc Janoschek·Nicholas P. Butch
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Abstract

Neutron scattering experiments on the spin-triplet superconductor 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 $\hat{a}$-axis. Up to fields of $\mu_0 H$=13 T, the maximal inelastic neutron spectral weight increases in energy transfer, with a pronounced increase in $d\hbar\omega_{peak}/dH$ near $\mu_0 H$=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 $\hat{a}$-axis fields near $\mu_0 H$=7~T induce a change in the hybridization between heavy $f$-electrons and the bare conduction band.

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Thomas Halloran, Gicela Saucedo Salas, Sylvia K. Lewin, J. A. Rodriguez-Rivera, Colin L. Sarkis, Jakob Lass, Daniel G. Mazzone, Marc Janoschek, Nicholas P. Butch. 2026-03-17. Field-direction sensitivity of Kondo hybridization in UTe$_2$. https://arxiv.org/abs/2603.17037

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