Anisotropy in cubic UO2 caused by electronic-lattice interactions
Despite many years of research, the full complexity of the electronic-lattice interactions in UO2 is not fully understood. We present X-ray inelastic scattering at low temperature showing that the interaction between electronic degrees of freedom and transverse acoustic phonons is strong only along the reciprocal space direction [100]. The anisotropy is reflected in the phonon-linewidth broadening, which persists also well above the N´eel temperature. This intrinsic effect infers an anisotropy in the thermal conductivity, which has been observed, but which is formally forbidden in a cubic material. We have no model capable of connecting our experimental observations with the low thermal conductivity of UO2 below room temperature.
PAOLASINI Luigi;
CHANEY Daneial;
BOSAK A.;
LANDER Gerard Heath;
CACIUFFO Roberto;
2021-07-22
AMER PHYSICAL SOC
JRC124241
2469-9950 (online),
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.104.024305,
https://publications.jrc.ec.europa.eu/repository/handle/JRC124241,
10.1103/PhysRevB.104.024305 (online),
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