The low-energy phonon dispersion of UBe13 has been measured by means of inelastic neutron scattering at room temperature and 10 K and elastic constants have been extracted. They are consistent with values obtained by scaling from pure beryllium, and the angular variation is almost isotropic. The lattice contribution to the low-temperature specific heat has been calculated from these data and is compared with the measured specific heats in the literature. © 1986 The American Physical Society.

Polarized neutron scattering techniques have been used to study the spatial distribution and temperature dependence of the magnetization induced in single crystals of UPt3, UBe13, and CeCu2Si2 by an externally applied magnetic field. We find that (a) the induced magnetization in the normal low-temperature state is predominatly of f-electronic character and that (b) the generalized electronic susceptibility (Q,0) where Q is a reciprocal-lattice vector), obtained by measurements with H