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Abstract:
We present an investigation of Yb-TM-Al phase diagrams with TM = Pd, Ag
and Au. Several new compounds have been characterized by measurements of
the magnetic susceptibility, the electrical resistivity and, in some
cases, the specific heat. It seems that the crossover from the
stable-trivalent to the intermediate-valent behavior occurs much more
abruptly in Yb- than in Ce-based compounds on changing the composition.
A comparison of the Ce-TM-Al compounds with their Yb homologs suggests
that replacement of Ce by Yb in an intermediate-valent Ce compound and
in a trivalent Ce compound results in an Yb3+ and in an Yb2+ state,
respectively.
