| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Seaborg Institutes: Emerging Topics in Actinide Sciences
|
| Presentation Title |
Interplay Between Phonon and Magnetic Excitations & its Impact on Low-temperature Thermal Transport in Thorium-uranium Mixed Oxides |
| Author(s) |
Saqeeb Adnan, Zilong Hua, Puspa Upreti, Michael Manley, David Hurley, Marat Khafizov |
| On-Site Speaker (Planned) |
Saqeeb Adnan |
| Abstract Scope |
The low-temperature anomalous magnetic and thermal properties of UO2 along with its nuclear applications, make it one of the most extensively studied actinides in the past few decades. In this study, we investigate the low-temperature thermal transport properties of thorium-doped uranium oxide (Th-UO2) with a wide range of doping concentrations. We used high-resolution inelastic X-ray scattering (IXS) measurements to capture the potential impact of magnetic excitations on the phonon properties. We also measured the thermal conductivity down to cryogenic temperatures using the spatial-domain thermoreflectance technique. The interaction between electron spin-waves and phonons results in a unique low-temperature thermal conductivity profile above Neel temperature that is suggestive of a dynamical Jahn-Teller effect. A first principle-based thermal transport model is implemented to isolate the influence of magnetic excitations on phonon lifetime. Our results provide insights into the spin-lattice interaction that dominates the low-temperature thermal transport in UO2. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Magnetic Materials, Other |