Transport Properties, Lattice Constants, Susceptibility and Specific Heat of UPd3
The intermetallic compound UPd3 shows a series of unexpected properties. It crystallizes in a hexagonal lattice of TiNi3-type and is thereby related more to the corresponding compounds formed by the fourvalent transition metals Ti,Zr, and Hf rather than those formed by the trivalent rare earth Pd3 compounds. This indicates that U prefers the 5f2 configuration. UPd3 is one of the few U-compounds for which crystalline field excitations have been observed by inelastic neutron scattering experiments1 indicating that the 5f electrons are well localized on the U sites in this metal. Andres et al2 have measured the specific heat c, the electrical resistivity ρ, the magnetic susceptibility χ down to 1K and the lattice constants at 298K and at 4.2K. The most striking result is a strongly sample dependent anomaly of the specific heat at 6K, which seems to be caused by a collective phenomenon due to quadrupolar interactions between U4+ ions.
KeywordsEntropy Helium Hexagonal
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