Abstract
Measurements of the elastic stiffness constants C ij and the bulk moduli of USb and USe have been performed at room temperature. Small or even negative Poisson's ratios are observed, which point to a possible intermediate valent behavior. Low-temperature sound velocity experiments on USe and UTe are presented. Whereas the transverse mode C 44 of USe and UTe shows close to the Curie temperature T c a strong temperature dependence accompanied by a rapidly changing attenuation, the longitudinal mode C 11 of USe behaves much less dramatic. We attribute this to a different coupling behavior of the longitudinal and the transverse modes with the rhombohedral lattice distortion that takes place below T c. For USe an elastic Debye temperature of 178 K could be derived.
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