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The ternary ytterbium transition-metal antimonides YbM2Sb2 (M = Zn, Cd) were confirmed by single-crystal X-ray diffraction studies to adopt the CaAl2Si2-type structure (P 3m1; a = 4.4424(6) Å, c = 7.4184(9) Å for YbZn 2Sb2; a = 4.6512(7) Å, c = 7.5661(11) Å for YbCd2Sb2). Electrical resistivity measurements on single crystals revealed weakly metallic behaviour, with a resistivity minimum near 80 K in the case of YbCd2Sb2. The Yb atoms are predominantly divalent, as indicat ed by band structure calculations and X-ray photoelectron spectroscopy on YbZn 2Sb2, but nonzero magnetic moments derived from magneti c susceptibility measurements and additional features in the experimental valence band spectrum provide evidence for the presence of some trivalent Yb spec i s.

Structure and physical properties of YbZn2Sb2 and YbCd2Sb2