Abstract
The compound YbCuGa has been synthesized and is found to crystallize in the orthorhombic CeCu 2 -type structure. Its magnetic susceptibility has been measured between 4.2 and 300 K and shows a broad maximum at about 190 K. This maximum is a characteristic feature of the mixed-valent Ce- and Yb-based compounds. The temperature-dependent resistivity exhibits an S-type behavior. The thermoelectric power is negative between 20 and 300 K and also shows a broad minimum at about 190 K. L 3 x-ray-absorption near-edge-structure (XANES) measurements show the two-peak pattern that corresponds to two different valence states of Yb. Thus, magnetic susceptibility, electrical resistivity, thermoelectric power, and L β XANES measurements all point to the mixed-valence nature of Yb ions in YbCuGa.
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