Non-magnon excitations in ferromagnetic van der Waals β-UTe<sub>3</sub>
ORAL
Abstract
Van-der-Waals (vdW) materials are a frontier in condensed matter physics where genuine 2-D physics can be explored in the monolayer. Inclusion of actinide elements into vdW materials leads to enhanced correlations and unique magnetism. Recent work has shown that β-UTe3 is an ideal candidate for probing such physics, having ferromagnetic order both in the bulk and monolayer limits with signs of 2-D correlations well-above the ferromagnetic transition. In this talk, I will discuss advancements in the neutron scattering studies of β-UTe3. The observed magnetic excitations are gapless but remarkably non-magnon like, having a bandwidth of > 15 meV. Additionally, the temperature-dependence of the magnetic excitations persist from 5 K to at least 150 K, ~10 times greater than the bulk ordering temperature. This work establishes the uniqueness of β-UTe3 as a vdW magnet, providing a new material which can both be used in novel devices and whose reduced dimensionality can be leveraged for increased tractability of modeling 5f magnetism.
*Work at Los Alamos National Laboratory was performed under the auspices of the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering. Research presented in this presentation was supported by the Laboratory Directed Research and Development program of Los Alamos National Laboratory under project number 20240083D. CSK gratefully acknowledges the support of the U.S. Department of Energy through the LANL/LDRD Program and the G. T. Seaborg Institute.
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Presenters
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Caitlin S Kengle
- Los Alamos National Laboratory