1. Connection between f-electron correlations and magnetic excitations in UTe2
- Author
-
Halloran, Thomas, Czajka, Peter, Salas, Gicela Saucedo, Frank, Corey, Kang, Chang-Jong, Rodriguez-Rivera, J. A., Lass, Jakob, Mazzone, Daniel G., Janoschek, Marc, Kotliar, Gabi, and Butch, Nicholas P.
- Subjects
Condensed Matter - Strongly Correlated Electrons ,Condensed Matter - Superconductivity - Abstract
The detailed anisotropy of the low-temperature, low-energy magnetic excitations of the candidate spin-triplet superconductor UTe$_2$ 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 $\mu_0 H=11$~T along the $\hat{c}-$axis, the magnetism is found to be field-independent in the $(hk0)$ plane. The scattering intensity is consistent with that expected from U$^{3+}$/U$^{4+}$ $f$-electron spins with preferential orientation along the crystallographic $\hat{a}$-axis, and a fluctuating magnetic moment of 2.3(7) $\mu_B$. These characteristics indicate that the excitations are due to intraband spin excitons arising from $f$-electron hybridization., Comment: 10 pages, 5 figures; Fixed typos
- Published
- 2024