Systematics of mixed valence and heavy fermion behaviors in YbCu5 and related systems

Neutron powder diffraction study of the site disorder in

“…These results demonstrate that the site disorder of Cu leads to the increase of T v . It has been reported that in polycrystalline samples YbIn 1Àx Cu 4þx the partial substitution of In by Cu increases T v [7]. This result is consistent with the present and previous ones [6], but the composition x dependence of T v for polycrystalline samples is different.…”