Moessbauer study of 170Yb in some metals and metal-like compounds. Isomer shift measurements and intermediate valence states of ytterbium

A report is presented on a Moessbauer effect study of the isomer shift and the magnetic behaviour of 170Yb in compounds with metallic character where the ytterbium valence state ranges from a practically divalent and diamagnetic state (Yb in Ag, Tm and Yb) to a trivalent magnetic state (Yb in Au). Intermediate valence states, all of them probably non-magnetic, have been observed in YbAl2, TmAl2, YbAl3 and Al as well as in the borides YbB4, YbB12 and TmB12. In Tm metal, in addition to the quadrupole interaction, a weak magnetic hyperfine interaction is visible on 170Yb below Tsub(N). (author)